<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div><span>I figured out what is going on i think. When strongSwan receives a 1514 <span class="yshortcuts cs4-visible" id="lw_1342915893_0">byte packet</span>
or one that is the full MTU from the outside website it does not have
anymore room to encapsulate it into an ESP packet to be sent back to the
client. I tried setting the MSS values and played around with he MTU
some more and it is still not working. Maybe I am setting the MSS wrong?
on the strongSwan eth0 interface i did "ip route add 192.168.1.1 dev
eth0 advmss 1400" and it still does not work?</span></div><div><br><span></span></div><div><span>Is this the problem with the received packets needing room for the ESP overhead?<br></span></div><div><br><span></span></div><span>Mark-</span><div><br></div> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Mark M <mark076h@yahoo.com><br> <b><span style="font-weight: bold;">To:</span></b> "users@lists.strongswan.org" <users@lists.strongswan.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, July 21, 2012 1:14 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [strongSwan] IP Fragmentation problems on some websites<br> </font> </div> <br>
<div id="yiv1450220823"><div><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:12pt;"><div>Hi,</div><div><br></div><div>I got my strongSwan gateway up and running. It is sitting behind my FIOS router and acting as VPN gateway for roadwarrior/mobile clients. I thought everything was working great until i noticed that some websites do not load. The first one i found was <a target="_blank" href="http://yahoo.com/">yahoo.com</a>. I fired up Wireshark and noticed when i receive packets back from yahoo.com my strongSwan gateway sends Fragmentation needed ICMP messages back. <br></div><div><br></div><div>Setting the MTU on my strongSwan gateway interfaces had no effect. I then set the MTU on my verizon FIOS router to 1400 and some pages would start to work ok, like yahoo.com would start to work but still others would not with the same fragmentation problem.</div><div><br></div><div>Instead of putting the
MTU on my FISO router way down and possibly have other
performance problems, is there an easy way to fix this? <br></div><div><br></div><div>Thanks for any help,</div><div><br></div><div>Mark-<br></div></div></div></div><br>_______________________________________________<br>Users mailing list<br><a ymailto="mailto:Users@lists.strongswan.org" href="mailto:Users@lists.strongswan.org">Users@lists.strongswan.org</a><br><a href="https://lists.strongswan.org/mailman/listinfo/users" target="_blank">https://lists.strongswan.org/mailman/listinfo/users</a><br><br> </div> </div> </div></body></html>