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<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Yes, exactly that. I am confused for the same reason. It also applies to other traffic types i.e. smb, rdp, etc. If I don’t permit it into openswan then
it doesn’t work and that makes absolutely no sense to me.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<div>
<div style="border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext"> Nick Howitt [mailto:n1ck.h0w1tt@gmail.com]
<br>
<b>Sent:</b> Wednesday, November 20, 2013 5:03 PM<br>
<b>To:</b> Fred Weston; neal.p.murphy@alum.wpi.edu; users@openswan.org<br>
<b>Subject:</b> Re: [Openswan Users] Firewall rules for openswan behind NAT</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Both traceroutes are going through the tunnel (no WAN IP hops). I don't understand why blocking ICMP at the gateway blocks these. Totally confused.
<span class="moz-smiley-s2">:-( </span>What about other traffic?</p>
<div>
<p class="MsoNormal">On 20/11/2013 21:49, Fred Weston wrote:</p>
</div>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Sorry, I didn’t see your request for traceroutes.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Here are traceroutes from a host behind openswan in site 1 to a host behind openswan in site 2 and vice versa. They look like I expect them to work, however
they only work when I allow ICMP into openswan from the Internet.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Tracing route to aws-useast-sp1.lpgaoffice.local [10.0.0.146]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">over a maximum of 30 hops:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 1 <1 ms <1 ms <1 ms aws-uswest-nat.lpgaoffice.local [10.1.0.67]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 2 85 ms 84 ms 99 ms aws-useast-nat.lpgaoffice.local [10.0.0.82]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 3 84 ms 84 ms 84 ms AWS-USEAST-SP1 [10.0.0.146]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Trace complete.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Tracing route to aws-uswest-sp1.lpgaoffice.local [10.1.0.38]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">over a maximum of 30 hops:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 1 1 ms <1 ms <1 ms aws-useast-nat.lpgaoffice.local [10.0.0.82]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 2 84 ms 84 ms 84 ms aws-uswest-nat.lpgaoffice.local [10.1.0.67]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> 3 84 ms 84 ms 84 ms sprestore.lpga.com [10.1.0.38]</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D">Trace complete.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt; font-family:"Calibri","sans-serif"; color:#1F497D"> </span></p>
<div>
<div style="border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"; color:windowtext">
<a href="mailto:users-bounces@lists.openswan.org">users-bounces@lists.openswan.org</a> [<a href="mailto:users-bounces@lists.openswan.org">mailto:users-bounces@lists.openswan.org</a>]
<b>On Behalf Of </b>Nick Howitt<br>
<b>Sent:</b> Wednesday, November 20, 2013 4:20 PM<br>
<b>To:</b> <a href="mailto:neal.p.murphy@alum.wpi.edu">neal.p.murphy@alum.wpi.edu</a>;
<a href="mailto:users@openswan.org">users@openswan.org</a><br>
<b>Subject:</b> Re: [Openswan Users] Firewall rules for openswan behind NAT</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12.0pt">As I said before, tunnel status is almost impossible to obtain.<br>
<br>
You can see the encryption being used in /var/log/secure. You are using AES128, modp2048 and SHA1 which is OK<br>
<br>
Your conns look absolutely fine and your tunnel is up. You have not explicitly defined the encryption so it has chosen a reasonable one (similar in strength to 3des but uses 1/3 cpu cycles). You don't need virtual_private with your set up and you don't need
protocols 50 and 51 through the firewall as ipsec with NAT-T is working.<br>
<br>
Neal's summary was pretty much spot on.<br>
<br>
Can you confirm you don't have a blank line after conn ...... and before type=tunnel in your conf files?<br>
<br>
Can you do the traceroutes/tracerts I asked for?<br>
<br>
Nick</p>
<div>
<p class="MsoNormal">On 20/11/2013 20:07, Neal Murphy wrote:</p>
</div>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<pre>On Wednesday, November 20, 2013 02:48:11 PM Fred Weston wrote:</pre>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<pre>All of this makes sense to me and I believe I have crossed everything you</pre>
<pre>listed off my troubleshooting list.</pre>
<pre> </pre>
<pre>Is there a way to see the status of the tunnel and what crypto is being</pre>
<pre>used to transmit packets between LANs?</pre>
</blockquote>
<pre> </pre>
<pre>If openswan is running on GNU/Linux and you are using KLIPS,</pre>
<pre> cd /proc/net</pre>
<pre> for i in ipsec_*; do</pre>
<pre> echo $i</pre>
<pre> sed -e 's/^/ /' $i</pre>
<pre> done</pre>
<pre>And peruse /proc/net/ipsec/.</pre>
<pre> </pre>
<pre>To obtain a deluge of info, '/usr/sbin/ipsec barf'.</pre>
<pre> </pre>
<pre> </pre>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<pre> </pre>
<pre>-----Original Message-----</pre>
<pre>From: <a href="mailto:users-bounces@lists.openswan.org">users-bounces@lists.openswan.org</a></pre>
<pre>[<a href="mailto:users-bounces@lists.openswan.org">mailto:users-bounces@lists.openswan.org</a>] On Behalf Of Neal Murphy Sent:</pre>
<pre>Wednesday, November 20, 2013 2:12 PM</pre>
<pre>To: <a href="mailto:users@openswan.org">users@openswan.org</a></pre>
<pre>Subject: Re: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre>You've addressed some or most of what's in the following bird's-eye view;</pre>
<pre>it shouldn't hurt to review in case you've overlooked something.</pre>
<pre> </pre>
<pre>You need to forward UDP ports 500 and 4500 on each firewall to the local</pre>
<pre>openswan box (limit it to coming from the remote IP/openswan box for added</pre>
<pre>security), and allow UDP ports 500 and 4500 out from the local openswan</pre>
<pre>box (preferably limit it to going to the remote openswan box for added</pre>
<pre>security). This will allow either end to start the VPN. Each firewall</pre>
<pre>should drop packets destined for the remote LAN(s) since they don't know</pre>
<pre>how to reach them. Logging them with a specific prefix would make it easy</pre>
<pre>to discover malconfigured nodes.</pre>
<pre> </pre>
<pre>I don't believe protocols 50 and 51 are used when NAT-T is used.</pre>
<pre> </pre>
<pre>Each internal node must have an explicit route to the remote LAN via the</pre>
<pre>local openswan box's IP.</pre>
<pre> </pre>
<pre>Each openswan box needs route(s) to the local internal LAN(s) and a default</pre>
<pre>route via the local firewall's internal IP address. Openswan takes care of</pre>
<pre>adding/removing routes to remote LANs when it brings VPNs up and down.</pre>
<pre> </pre>
<pre>Do you have a 'config setup' in each ipsec.conf, possibly similar to:</pre>
<pre> protostack=klips # or netkey or mast</pre>
<pre> interfaces=%defaultroute</pre>
<pre> klipsdebug=none</pre>
<pre> plutodebug=none</pre>
<pre> plutowait=no</pre>
<pre> uniqueids=yes</pre>
<pre> nat_traversal=yes</pre>
<pre>You might need a virtual_private declaration describing your internal LANs,</pre>
<pre>but probably not, since you aren't using a road warrior setup.</pre>
<pre> </pre>
<pre>In each conn spec, you may need to specify ike= and esp=; that is, tell</pre>
<pre>openswan which encrytpion to use. I don't know what happens if you don't</pre>
<pre>specify any encryption methods. (Does openswan then transmit in the</pre>
<pre>clear?)</pre>
<pre> </pre>
<pre>I haven't played with NAT Traversal lately; I forget how to configure a</pre>
<pre>conn to make NAT-T work.</pre>
<pre> </pre>
<pre>N</pre>
<pre> </pre>
<pre>On Wednesday, November 20, 2013 12:28:35 PM Fred Weston wrote:</pre>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<pre>I cannot ping LAN-LAN without the tunnel.</pre>
<pre> </pre>
<pre>In site A I have 10.0.0.0/16 and in site B I have 10.1.0.0/16. In</pre>
<pre>each site the routing table has an entry for the opposite site’s IP</pre>
<pre>space which is pointed at the local openswan box.</pre>
<pre> </pre>
<pre>I think we are confusing firewall and tunnel terminology. The</pre>
<pre>firewall I am speaking of is builtin to AWS and controls ingress and</pre>
<pre>egress traffic from the openswan boxes. It is something that is part</pre>
<pre>of the AWS network stack and the only thing I can do to it is change its</pre>
<pre>ruleset.</pre>
<pre> </pre>
<pre>The traffic between sites is traversing the openswan tunnel, however</pre>
<pre>when it’s doing so it isn’t being encrypted, so for instance when I</pre>
<pre>send RDP traffic across the tunnel, the AWS firewall sees RDP traffic</pre>
<pre>and doesn’t let it through. If the tunnel were encrypting traffic,</pre>
<pre>all the AWS firewall should see is UDP traffic coming into port 500</pre>
<pre>and it should have no idea what that traffic is, but it’ll allow it</pre>
<pre>because I’ve told it to permit udp/500 inbound.</pre>
<pre> </pre>
<pre>In the diagram below I’ve notated where the AWS firewall at each site</pre>
<pre>is inspecting traffic. The issue is that the traffic coming across</pre>
<pre>the tunnel is in the clear.</pre>
<pre> </pre>
<pre>[<a href="cid:image002.jpg@01CEE5EC.06F0A5C0">cid:image002.jpg@01CEE5EC.06F0A5C0</a>]</pre>
<pre> </pre>
<pre>From: Nick Howitt [<a href="mailto:n1ck.h0w1tt@gmail.com">mailto:n1ck.h0w1tt@gmail.com</a>]</pre>
<pre>Sent: Wednesday, November 20, 2013 3:36 AM</pre>
<pre>To: Fred Weston</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a></pre>
<pre>Subject: Re: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre> </pre>
<pre>I am curious that your are even pinging LAN-LAN outside the tunnel.</pre>
<pre>You have private subnets and the internet would not know where to find</pre>
<pre>a 10.x.y.z address. Can you do a tracert/traceroute end to end with</pre>
<pre>and without the firewall?</pre>
<pre> </pre>
<pre>On your gateways to you have routes set up to your far LAN's via your</pre>
<pre>Openswan devices?</pre>
<pre> </pre>
<pre>Can you ping from 10.0.0.82 to 10.1.0.67 or vice-versa with the</pre>
<pre>firewall up and down?</pre>
<pre> </pre>
<pre>On 2013-11-19 17:14, Fred Weston wrote:</pre>
<pre>The tunnel comes up either way but I can't ping unless I permit icmp</pre>
<pre>from the Internet into openswan. I'm pinging from another device</pre>
<pre>behind openswan.</pre>
<pre> </pre>
<pre>Thanks ,</pre>
<pre>FW</pre>
<pre> </pre>
<pre>On Nov 19, 2013, at 11:40 AM, "Nick Howitt"</pre>
<pre><<a href="mailto:n1ck.h0w1tt@gmail.com">n1ck.h0w1tt@gmail.com</a><a href="mailto:n1ck.h0w1tt@gmail.com"><mailto:n1ck.h0w1tt@gmail.com></a>> wrote:</pre>
<pre> </pre>
<pre>OK that shows the tunnel is up. Is that with or without the firewall</pre>
<pre>(and btw it is using NAT-T so you should not need protocols 50 and 51</pre>
<pre>through your firewall).</pre>
<pre> </pre>
<pre>When you are pinging end to end, is that from the openswan device or</pre>
<pre>from another LAN device?</pre>
<pre> </pre>
<pre>On 2013-11-19 14:03, Fred Weston wrote:</pre>
<pre>This is what I see in the log; it looks like it’s encrypting traffic</pre>
<pre>but that doesn’t seem to be the case based upon the behavior I’m</pre>
<pre>seeing. If it is encrypting then the firewall in front of openswan</pre>
<pre>should have no effect on the traffic I can pass over the tunnel as</pre>
<pre>long as the tunnel is up.</pre>
<pre> </pre>
<pre>Nov 19 14:00:55 ip-10-0-0-82 pluto[12517]: "vpc1-to-vpc2" #1:</pre>
<pre>NAT-Traversal: Result using RFC 3947 (NAT-Traversal): both are NATed</pre>
<pre>Nov</pre>
<pre>19 14:00:55 ip-10-0-0-82 pluto[12517]: "vpc1-to-vpc2" #1: transition</pre>
<pre>from state STATE_MAIN_I2 to state STATE_MAIN_I3 Nov 19 14:00:55</pre>
<pre>ip-10-0-0-82</pre>
<pre>pluto[12517]: "vpc1-to-vpc2" #1: STATE_MAIN_I3: sent MI3, expecting</pre>
<pre>MR3 Nov 19 14:00:55 ip-10-0-0-82 pluto[12517]: "vpc1-to-vpc2" #1:</pre>
<pre>received Vendor ID payload [CAN-IKEv2] Nov 19 14:00:55 ip-10-0-0-82</pre>
<pre>pluto[12517]: "vpc1-to-vpc2" #1: Main mode peer ID is ID_IPV4_ADDR:</pre>
<pre>'50.18.211.121' Nov</pre>
<pre>19 14:00:55 ip-10-0-0-82 pluto[12517]: "vpc1-to-vpc2" #1: transition</pre>
<pre>from state STATE_MAIN_I3 to state STATE_MAIN_I4 Nov 19 14:00:55</pre>
<pre>ip-10-0-0-82</pre>
<pre>pluto[12517]: "vpc1-to-vpc2" #1: STATE_MAIN_I4: ISAKMP SA established</pre>
<pre>{auth=OAKLEY_PRESHARED_KEY cipher=aes_128 prf=oakley_sha</pre>
<pre>group=modp2048} Nov 19 14:00:55 ip-10-0-0-82 pluto[12517]:</pre>
<pre>"vpc1-to-vpc2" #2: initiating Quick Mode</pre>
<pre>PSK+ENCRYPT+TUNNEL+PFS+UP+IKEv2ALLOW+SAREFTRACK {using isakmp#1</pre>
<pre>msgid:463435ec proposal=defaults pfsgroup=OAKLEY_GROUP_MODP2048} Nov</pre>
<pre>19</pre>
<pre>14:00:56 ip-10-0-0-82 pluto[12517]: "vpc1-to-vpc2" #2: transition from</pre>
<pre>state STATE_QUICK_I1 to state STATE_QUICK_I2 Nov 19 14:00:56</pre>
<pre>ip-10-0-0-82</pre>
<pre>pluto[12517]: "vpc1-to-vpc2" #2: STATE_QUICK_I2: sent QI2, IPsec SA</pre>
<pre>established tunnel mode {ESP=>0x54dd12fe <0x2bb3e074</pre>
<pre>xfrm=AES_128-HMAC_SHA1 NATOA=none NATD=50.18.211.121:4500 DPD=none}</pre>
<pre> </pre>
<pre>From: Nick Howitt [<a href="mailto:n1ck.h0w1tt@gmail.com">mailto:n1ck.h0w1tt@gmail.com</a>]</pre>
<pre>Sent: Tuesday, November 19, 2013 8:21 AM</pre>
<pre>To: Fred Weston</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a><a href="mailto:users@lists.openswan.org"><mailto:users@lists.openswan.org></a></pre>
<pre>Subject: RE: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre> </pre>
<pre>What are you getting in /var/log/secure - just the bit where the</pre>
<pre>tunnel is negotiating, not the bit where ipsec loads?</pre>
<pre> </pre>
<pre>Also what do you have in the "config setup" sections of your conf files?</pre>
<pre> </pre>
<pre>On 2013-11-19 13:14, Fred Weston wrote:</pre>
<pre>So here’s something interesting…this morning just for the heck of it,</pre>
<pre>I added ICMP to the permit list and that immediately got ping working.</pre>
<pre> </pre>
<pre>Since the tunnel shouldn’t require ICMP, that got me thinking that the</pre>
<pre>traffic isn’t actually being encrypted. I verified that by trying to</pre>
<pre>remote desktop to a host on the far side of the tunnel. It didn’t</pre>
<pre>work when I have the firewall rules set to only allow the few</pre>
<pre>ports/protocols the tunnel should need, but as soon as I changed the</pre>
<pre>ruleset to permit all traffic RDP worked, so it seems the problem is</pre>
<pre>actually that the tunnel isn’t encrypting the traffic.</pre>
<pre> </pre>
<pre>I’m not quite sure why this is.</pre>
<pre> </pre>
<pre>Here are the configs from each side, can someone comment as to what I</pre>
<pre>need to add to get the traffic to be encrypted?</pre>
<pre> </pre>
<pre>conn vpc1-to-vpc2</pre>
<pre> </pre>
<pre> type=tunnel</pre>
<pre> authby=secret</pre>
<pre> left=%defaultroute</pre>
<pre> leftid=107.21.17.86</pre>
<pre> leftnexthop=%defaultroute</pre>
<pre> leftsubnet=10.0.0.0/16</pre>
<pre> leftsourceip=10.0.0.82</pre>
<pre> right=50.18.211.121</pre>
<pre> rightsubnet=10.1.0.0/16</pre>
<pre> pfs=yes</pre>
<pre> auto=start</pre>
<pre> phase2=esp</pre>
<pre> </pre>
<pre>conn vpc2-to-vpc1</pre>
<pre> </pre>
<pre> type=tunnel</pre>
<pre> authby=secret</pre>
<pre> left=%defaultroute</pre>
<pre> leftid=50.18.211.121</pre>
<pre> leftnexthop=%defaultroute</pre>
<pre> leftsubnet=10.1.0.0/16</pre>
<pre> leftsourceip=10.1.0.67</pre>
<pre> right=107.21.17.86</pre>
<pre> rightsubnet=10.0.0.0/16</pre>
<pre> pfs=yes</pre>
<pre> auto=start</pre>
<pre> phase2=esp</pre>
<pre> </pre>
<pre>From: Nick Howitt [<a href="mailto:n1ck.h0w1tt@gmail.com">mailto:n1ck.h0w1tt@gmail.com</a>]</pre>
<pre>Sent: Tuesday, November 19, 2013 5:19 AM</pre>
<pre>To: Fred Weston</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a><a href="mailto:users@lists.openswan.org"><mailto:users@lists.openswan.org></a></pre>
<pre>Subject: RE: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre> </pre>
<pre>Yes, I was picturing firewalling in the hosts.</pre>
<pre> </pre>
<pre>Have a look in the logs and see if Openswan is connecting with or</pre>
<pre>without NAT-T when your firewall is not up. Then, with your</pre>
<pre>firewalling, try forceencaps=yes in the conn and nat_traversal=yes in</pre>
<pre>config setup.</pre>
<pre> </pre>
<pre>For minor tunnel info I use "service ipsec status", but it depends on</pre>
<pre>your distro and the information is almost useless. You can also have a</pre>
<pre>look at "ip xfrm" and "ip route".</pre>
<pre> </pre>
<pre>Nick</pre>
<pre> </pre>
<pre>On 2013-11-19 10:03, Fred Weston wrote:</pre>
<pre>I think you’re picturing the firewalling taking place on the openswan</pre>
<pre>hosts, which isn’t the case. There isn’t a firewall on either</pre>
<pre>openswan box (other than any standard firewall that may be enabled by</pre>
<pre>default). The firewall rules I am manipulating are in the network / NAT</pre>
<pre>device in front of openswan. Since the tunnel works when I permit all</pre>
<pre>traffic to openswan, that would seem to discount the possibility of</pre>
<pre>any firewall issues on the hosts themselves.</pre>
<pre> </pre>
<pre>I’ll take a look at the logs to see if they show anything interesting.</pre>
<pre>Is there a utility that will show tunnel status?</pre>
<pre> </pre>
<pre>From: Nick Howitt [<a href="mailto:n1ck.h0w1tt@gmail.com">mailto:n1ck.h0w1tt@gmail.com</a>]</pre>
<pre>Sent: Tuesday, November 19, 2013 3:44 AM</pre>
<pre>To: Fred Weston</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a><a href="mailto:users@lists.openswan.org"><mailto:users@lists.openswan.org></a></pre>
<pre>Subject: RE: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre> </pre>
<pre>For your rules, I was hoping for something like the output to</pre>
<pre>"iptables -L -n -v" and "iptables -t nat -L -n -v" rather than a</pre>
<pre>description of the rules.</pre>
<pre> </pre>
<pre>Forceencaps is unlikely but can be useful</pre>
<pre> </pre>
<pre>Openswan/ipsec logs are typically found in /var/log/secure depending</pre>
<pre>on your system. If you have dpd enabled you should see constant tunnel</pre>
<pre>renegotiation if the tunnel has gone down. You'll see nothing odd if</pre>
<pre>the tunnel is up but no traffic is passing. When the tunnel is up you</pre>
<pre>should see in the logs something like "IPSec SA Established".</pre>
<pre>Available status information is not particulrly helpful.</pre>
<pre> </pre>
<pre>Can you also try adding a firewall rule something like:</pre>
<pre> </pre>
<pre>iptables -t nat -I POSTROUTING -m policy --dir out --pol ipsec -j</pre>
<pre>ACCEPT</pre>
<pre> </pre>
<pre>Either that or somthing in the post routing chain which allows traffic</pre>
<pre>between the local and remote subnets, but this rule is more flexible</pre>
<pre>as you don't need to specify the subnets.</pre>
<pre> </pre>
<pre>Nick</pre>
<pre> </pre>
<pre>On 2013-11-18 23:28, Fred Weston wrote:</pre>
<pre> </pre>
<pre>From:</pre>
<pre><a href="mailto:users-bounces@lists.openswan.org">users-bounces@lists.openswan.org</a><a href="mailto:users-bounces@lists.openswan.org"><mailto:users-bounces@lists.openswan.o</a></pre>
<pre><span class="MsoHyperlink"><a href="mailto:users-bounces@lists.openswan.org">rg></a></span> [<a href="mailto:users-bounces@lists.openswan.org">mailto:users-bounces@lists.openswan.org</a>] On Behalf Of Nick Howitt</pre>
<pre> </pre>
<pre>Can you post the exact rules you are using?</pre>
<pre> </pre>
<pre>I included those in my original message.</pre>
<pre>*:* > UDP 500</pre>
<pre>*:* > UDP 4500</pre>
<pre>* > IP Protocol 50</pre>
<pre>* > IP Protocol 51</pre>
<pre> </pre>
<pre>Also have you tried forcing encapsulation with forceencaps=yes in your</pre>
<pre>conns?</pre>
<pre> </pre>
<pre>No, I haven’t tried that.</pre>
<pre> </pre>
<pre>When you say "things stop working" does the tunnel come down, or does</pre>
<pre>traffic just fail to pass?</pre>
<pre> </pre>
<pre>I’m not sure how to tell the difference, my test methodology was to</pre>
<pre>ping a host on the far side of the tunnel and when I change the</pre>
<pre>firewall rules from wide open to those above the ping starts timing</pre>
<pre>out. How can I tell what state the tunnel is in?</pre>
<pre> </pre>
<pre>Regards,</pre>
<pre> </pre>
<pre>Nick</pre>
<pre> </pre>
<pre>On 2013-11-17 17:13, Fred Weston wrote:</pre>
<pre>Does anyone else have any suggestions? I would like to implement this</pre>
<pre>in production but I am hesitant to do so when the only way I can get</pre>
<pre>it to work is permit all traffic from the Internet into the openswan</pre>
<pre>boxes.</pre>
<pre> </pre>
<pre>From:</pre>
<pre><a href="mailto:users-bounces@lists.openswan.org">users-bounces@lists.openswan.org</a><a href="mailto:users-bounces@lists.openswan.org"><mailto:users-bounces@lists.openswan.o</a></pre>
<pre><span class="MsoHyperlink"><a href="mailto:users-bounces@lists.openswan.org">rg></a></span> [<a href="mailto:users-bounces@lists.openswan.org">mailto:users-bounces@lists.openswan.org</a>] On Behalf Of Fred Weston</pre>
<pre>Sent:</pre>
<pre>Wednesday, November 13, 2013 11:49 AM</pre>
<pre>To: Leto</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a><a href="mailto:users@lists.openswan.org"><mailto:users@lists.openswan.org></a></pre>
<pre>Subject: Re: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre>Let me clarify – when I reference ports/protocols that I’m allowing</pre>
<pre>inbound, I’m allowing it from the opposite host and not specifying a</pre>
<pre>source port.</pre>
<pre> </pre>
<pre>Thanks,</pre>
<pre>FW</pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre>From: Leto [<a href="mailto:letoams@gmail.com">mailto:letoams@gmail.com</a>]</pre>
<pre>Sent: Wednesday, November 13, 2013 11:27 AM</pre>
<pre>To: Fred Weston</pre>
<pre>Cc: <a href="mailto:users@lists.openswan.org">users@lists.openswan.org</a><a href="mailto:users@lists.openswan.org"><mailto:users@lists.openswan.org></a></pre>
<pre>Subject: Re: [Openswan Users] Firewall rules for openswan behind NAT</pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre>sent from a tiny device</pre>
<pre> </pre>
<pre>On 2013-11-13, at 10:44, Fred Weston</pre>
<pre><<a href="mailto:fred.weston@lpga.com">fred.weston@lpga.com</a><a href="mailto:fred.weston@lpga.com"><mailto:fred.weston@lpga.com></a>> wrote: Hello All,</pre>
<pre> </pre>
<pre>I’m using OpenSwan with AWS to link two private VPC networks in</pre>
<pre>different regions.</pre>
<pre> </pre>
<pre>I’m having trouble getting my firewall ACLs right. Everything works</pre>
<pre>if I permit all traffic to the OpenSwan boxes, however when I try to</pre>
<pre>get more restrictive and permit only the necessary ports things stop</pre>
<pre>working.</pre>
<pre> </pre>
<pre>One side has all traffic permitted inbound for the time being and I’m</pre>
<pre>making ACL changes trying to restrict traffic to certain</pre>
<pre>ports/protocols on the other side.</pre>
<pre> </pre>
<pre>Both endpoints are behind 1:1 NAT. Everything is permitted outbound</pre>
<pre>on both sides.</pre>
<pre> </pre>
<pre>From reading online, I understand that the following ports and</pre>
<pre>protocols should be all I need:</pre>
<pre> </pre>
<pre>UDP 500</pre>
<pre>UDP 4500</pre>
<pre>IP Protocol 50</pre>
<pre>IP Protocol 51</pre>
<pre> </pre>
<pre>I tried the above and had no luck. As soon as I change from</pre>
<pre>permitting all inbound to permitting only the above list the tunnel comes</pre>
<pre>down.</pre>
<pre> </pre>
<pre>You should really allow icmp.</pre>
<pre> </pre>
<pre>Note that you need to accept from a random high port to dest udp 4500,</pre>
<pre>not just 4500 <-> 4500. Same for 500</pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre> </pre>
<pre>I also tried permitting tcp/1721 and tcp/1723 and IP Protocol 47.</pre>
<pre> </pre>
<pre>I am using AWS ‘security groups’ to control filtering and according to</pre>
<pre>the docs (and my observations) security groups are stateful, so I am</pre>
<pre>not sure why this isn’t working.</pre>
<pre> </pre>
<pre>Can anyone offer any suggestions?</pre>
</blockquote>
</blockquote>
<pre>_______________________________________________</pre>
<pre><a href="mailto:Users@lists.openswan.org">Users@lists.openswan.org</a></pre>
<pre><a href="https://lists.openswan.org/mailman/listinfo/users">https://lists.openswan.org/mailman/listinfo/users</a></pre>
<pre>Micropayments: <a href="https://flattr.com/thing/38387/IPsec-for-Linux-made-easy">https://flattr.com/thing/38387/IPsec-for-Linux-made-easy</a></pre>
<pre>Building and Integrating Virtual Private Networks with Openswan:</pre>
<pre><a href="http://www.amazon.com/gp/product/1904811256/104-3099591-2946327?n=283155">http://www.amazon.com/gp/product/1904811256/104-3099591-2946327?n=283155</a></pre>
</blockquote>
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