<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><br><br>sent from a tiny device </div><div><br>On 2013-11-13, at 10:44, Fred Weston <<a href="mailto:fred.weston@lpga.com">fred.weston@lpga.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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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>
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<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>
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<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>
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<p class="MsoNormal">Both endpoints are behind 1:1 NAT. Everything is permitted outbound on both sides.</p>
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<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>
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<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></div></div></blockquote><div><br></div><div>You should really allow icmp.</div><div><br></div><div>Note that you need to accept from a random high port to dest udp 4500, not just 4500 <-> 4500. Same for 500</div><div><br></div><div><br></div><br><blockquote type="cite"><div><div class="WordSection1">
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<p class="MsoNormal">I also tried permitting tcp/1721 and tcp/1723 and IP Protocol 47.</p>
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<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">Can anyone offer any suggestions?</p>
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<p class="MsoNormal">Thanks,</p>
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<p class="MsoNormal"><b><span style="font-family:"Verdana","sans-serif"">Fred Weston</span></b></p>
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</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span><a href="mailto:Users@lists.openswan.org">Users@lists.openswan.org</a></span><br><span><a href="https://lists.openswan.org/mailman/listinfo/users">https://lists.openswan.org/mailman/listinfo/users</a></span><br><span>Micropayments: <a href="https://flattr.com/thing/38387/IPsec-for-Linux-made-easy">https://flattr.com/thing/38387/IPsec-for-Linux-made-easy</a></span><br><span>Building and Integrating Virtual Private Networks with Openswan:</span><br><span><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><br></div></blockquote></body></html>