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<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">Hi there,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:14.65pt;background:white">
<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">I'm running a Debian 7.8 openswan 1:2.6.37-3+deb7u1 server with one external interface, but many different aliases :<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.94/24 brd xxx.xxx.xxx.255 scope
global eth1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.93/29 brd xxx.xxx.xxx.95 scope
global eth1:ovpn<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.35/27 brd xxx.xxx.xxx.63 scope
global eth1:mail1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.75/29 brd xxx.xxx.xxx.79 scope
global eth1:mail2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.10/27 brd xxx.xxx.xxx.31 scope
global eth1:web1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.82/29 brd xxx.xxx.xxx.87 scope
global eth1:ipsec2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.36/27 brd xxx.xxx.xxx.63 scope
global secondary eth1:web2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.76/29 brd xxx.xxx.xxx.79 scope
global secondary eth1:web3<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.3/27 brd xxx.xxx.xxx.31 scope
global secondary eth1:gate1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.34/27 brd xxx.xxx.xxx.63 scope
global secondary eth1:gate2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.5/27 brd xxx.xxx.xxx.31 scope
global secondary eth1:mail<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">inet xxx.xxx.xxx.92/29 brd xxx.xxx.xxx.95 scope
global secondary eth1:ipsec<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:14.65pt;background:white"><span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">My "main"-connections use xxx.xxx.xxx.94, but only one <b><span style="border:none windowtext 1.0pt;padding:0cm">has</span></b> to
use xxx.xxx.xxx.92. If at my server I start up the connection using .92, all packets exit the interface with the .94 IP, of course getting </span><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">NO_PROPOSAL_CHOSEN
msgid=00000000</span><span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE"> at phase 1.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:14.65pt;background:white">
<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">I also found, that all my other IPSec servers (creating tunnels to .94) sometimes receive ESP packets from .92, despite there being not a
single connection using this IP to them.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:14.65pt;background:white">
<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">If the other side initiates the connection to .92 the server responds with the correct IP and the tunnel is established. Here is an excerpt
from my ipsec.conf:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">uniqueids=yes<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">nhelpers=0<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">interfaces="ipsec0=eth1"<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">conn site2site<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">authby=secret<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">right=xxx.xxx.xxx.92<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">rightsubnet=192.168.0.0/24<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">rightnexthop=xxx.xxx.xxx.91<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">left=xxx.xxx.xxx.21<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">leftid="xxx.xxx.xxx.21"<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">ikelifetime=480m<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">keylife=3600s<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">rekeymargin=5m<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">keyingtries=0<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">auto=start<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">ike=3des-sha1;modp1024<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">esp=3des-sha1;modp1024<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">conn site2site-1<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">leftsubnet=172.16.0.0/12<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">also=site2site<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">conn site2site-2<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">leftsubnet=10.182.0.0/15<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">also=site2site<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:14.65pt;background:white">
<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">I tried adding an iptables rule to SNAT the packets src: .94 dst: .21 to source .92, but to no avail, they keep leaving from the wrong interface:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:#EEEEEE"><span lang="EN-US" style="font-size:10.0pt;font-family:Consolas;color:#222222;border:none windowtext 1.0pt;padding:0cm;background:#EEEEEE;mso-fareast-language:DE">iptables -t nat -A POSTROUTING -s xxx.xxx.xxx.94
-d xxx.xxx.xxx.21 -j SNAT --to-source xxx.xxx.xxx.92<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;line-height:14.65pt;background:white">
<span lang="EN-US" style="font-size:11.5pt;font-family:"Helvetica","sans-serif";color:#222222;mso-fareast-language:DE">Anyone got some better idea or want to point me in the right direction here?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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