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<p class="MsoNormal"><span style="color:#1F497D">Let me clarify – when I reference ports/protocols that I’m allowing inbound, I’m allowing it from the opposite host and not specifying a source port.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is ICMP required for functionality or only for ease of troubleshooting? Typically I only allow it if I need it for some reason.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,</span></p>
<p class="MsoNormal"><span style="color:#1F497D">FW</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt; font-family:"Tahoma","sans-serif""> Leto [mailto:letoams@gmail.com]
<br>
<b>Sent:</b> Wednesday, November 13, 2013 11:27 AM<br>
<b>To:</b> Fred Weston<br>
<b>Cc:</b> users@lists.openswan.org<br>
<b>Subject:</b> Re: [Openswan Users] Firewall rules for openswan behind NAT</span></p>
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<p class="MsoNormal"><br>
<br>
sent from a tiny device </p>
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On 2013-11-13, at 10:44, Fred Weston <<a href="mailto:fred.weston@lpga.com">fred.weston@lpga.com</a>> wrote:</p>
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<p class="MsoNormal">Hello All,</p>
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<p class="MsoNormal">I’m using OpenSwan with AWS to link two private VPC networks in different regions.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m having trouble getting my firewall ACLs right. Everything works if I permit all traffic to the OpenSwan boxes, however when I try to get more restrictive and permit only the necessary ports things stop working.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">One side has all traffic permitted inbound for the time being and I’m making ACL changes trying to restrict traffic to certain ports/protocols on the other side.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Both endpoints are behind 1:1 NAT. Everything is permitted outbound on both sides.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">From reading online, I understand that the following ports and protocols should be all I need:</p>
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<p class="MsoNormal">UDP 500</p>
<p class="MsoNormal">UDP 4500</p>
<p class="MsoNormal">IP Protocol 50</p>
<p class="MsoNormal">IP Protocol 51</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I tried the above and had no luck. As soon as I change from permitting all inbound to permitting only the above list the tunnel comes down.</p>
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<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman","serif"">You should really allow icmp.</span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman","serif""> </span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman","serif"">Note that you need to accept from a random high port to dest udp 4500, not just 4500 <-> 4500. Same for 500</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal">I also tried permitting tcp/1721 and tcp/1723 and IP Protocol 47.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I am using AWS ‘security groups’ to control filtering and according to the docs (and my observations) security groups are stateful, so I am not sure why this isn’t working.
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<p class="MsoNormal"> </p>
<p class="MsoNormal">Can anyone offer any suggestions?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span style="font-family:"Verdana","sans-serif"">Fred Weston</span></b></p>
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<p class="MsoNormal"><span style="font-size:12.0pt; font-family:"Times New Roman","serif"">_______________________________________________<br>
<a href="mailto:Users@lists.openswan.org">Users@lists.openswan.org</a><br>
<a href="https://lists.openswan.org/mailman/listinfo/users">https://lists.openswan.org/mailman/listinfo/users</a><br>
Micropayments: <a href="https://flattr.com/thing/38387/IPsec-for-Linux-made-easy">
https://flattr.com/thing/38387/IPsec-for-Linux-made-easy</a><br>
Building and Integrating Virtual Private Networks with Openswan:<br>
<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></span></p>
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The information transmitted in this message (including any attachments) is intended only for the use of the individual(s) and/or entity(ies) to which it is addressed and may contain confidential business information which should not be disclosed. If you are
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