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<p class=MsoNormal>Hi,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have the following network configuration:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><Private subnet 196.34.X.X/24> --- <196.25.X.X>
< < ==== IPSEC VPN TUNNEL ==== > > <41.X.X.X>
<ALIAS 192.168.253.1><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I am connecting from my server to a 3<sup>rd</sup> party. I want
to be able to allow access to an Apache server instance running on an aliased
private IP (192.168.253.1). I have setup the alias and configured OpenSwan as
best as I can tell.<o:p></o:p></p>
<p class=MsoNormal>The tunnel appears to be coming up however no packets are
being routed via the tunnel from either side. I have a feeling I need to setup
special IPTABLES POSTROUTING rules for the traffic destined to their private
subnet (196.34.X.X/24) to be routed via the tunnel, however I am unsure how to
achieve this.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Here is my connection setting:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>## connection definition 3rdParty ##<o:p></o:p></p>
<p class=MsoNormal>conn party-ipsec-vpn<o:p></o:p></p>
<p class=MsoNormal> authby=secret<o:p></o:p></p>
<p class=MsoNormal> auto=start<o:p></o:p></p>
<p class=MsoNormal>
ike=3des-sha1;modp1024<o:p></o:p></p>
<p class=MsoNormal> ikelifetime=1440m<o:p></o:p></p>
<p class=MsoNormal> ## phase 1 ##<o:p></o:p></p>
<p class=MsoNormal> keyexchange=ike<o:p></o:p></p>
<p class=MsoNormal> ## phase 2 ##<o:p></o:p></p>
<p class=MsoNormal> phase2=esp<o:p></o:p></p>
<p class=MsoNormal>
phase2alg=3des-sha1;modp1024<o:p></o:p></p>
<p class=MsoNormal> compress=no<o:p></o:p></p>
<p class=MsoNormal> # Perfect Forward
Secrecy<o:p></o:p></p>
<p class=MsoNormal> pfs=yes<o:p></o:p></p>
<p class=MsoNormal> type=tunnel<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> left=196.25.X.X<o:p></o:p></p>
<p class=MsoNormal>
leftsourceip=196.34.X.10<o:p></o:p></p>
<p class=MsoNormal>
leftsubnet=196.34.X.X/24<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> right=41.X.X.X<o:p></o:p></p>
<p class=MsoNormal> rightsubnet=192.168.253.0/24<o:p></o:p></p>
<p class=MsoNormal>
rightsourceip=192.168.253.1<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>When I start the tunnel, it appears to work/come up:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal># ipsec auto --up easypay-ipsec-vpn<o:p></o:p></p>
<p class=MsoNormal>117 "easypay-ipsec-vpn" #4: STATE_QUICK_I1:
initiate<o:p></o:p></p>
<p class=MsoNormal>004 "easypay-ipsec-vpn" #4: STATE_QUICK_I2: sent
QI2, IPsec SA established tunnel mode {ESP=>0x07707bb5 <0xc435a5c2
xfrm=3DES_0-HMAC_SHA1 NATOA=none NATD=none DPD=none}<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>But when I try telnet/ping etc to the 196.34.X.X/24
range, if I run a tcpdump (tcpdump -vv -i any -n dst host 196.34.X.X) it
shows ARP requests with no response.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>ip xfrm policy has the route from 253.0/24->196.34.X.X/24
and via versa.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i># cat /etc/redhat-release <o:p></o:p></i></p>
<p class=MsoNormal>CentOS release 6.7 (Final)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i># ipsec --version<o:p></o:p></i></p>
<p class=MsoNormal>Linux Openswan U2.6.32/K2.6.32-573.22.1.el6.x86_64 (netkey)<o:p></o:p></p>
<p class=MsoNormal>See `ipsec --copyright' for copyright information.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Not sure what other info may be required?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Any assistance will be greatly appreciated!<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thank you<o:p></o:p></p>
<p class=MsoNormal>Kevin (from South Africa)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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