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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Also the UDP checksum in the IKE_SA_INIT response shows incorrect in wireshark.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Balaji Thoguluva Bapulal <br><b>Sent:</b> Saturday, April 14, 2018 10:42 PM<br><b>To:</b> users@lists.strongswan.org<br><b>Subject:</b> IKE_SA_INIT response with notification data missing<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Dear users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am trying to establish a IKEv2/IPsec tunnel from a security gateway towards strongswan with strongswan acting as a responder. In response to IKE_SA_INIT request packet, strongswan sends back IKE_SA_INIT response with a Notify payload of MULTIPLE_AUTH_SUPPORTED with notification data missing. I have attached the wireshark. It would be great if someone can explain why this behavior.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>[IKEv2]$ ipsec --version<o:p></o:p></p><p class=MsoNormal>Linux strongSwan U5.3.0/K3.8.13-16.2.1.el6uek.x86_64<o:p></o:p></p><p class=MsoNormal>Institute for Internet Technologies and Applications<o:p></o:p></p><p class=MsoNormal>University of Applied Sciences Rapperswil, Switzerland<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>The following is the configuration.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>config setup<o:p></o:p></p><p class=MsoNormal> charondebug=all<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>conn %default<o:p></o:p></p><p class=MsoNormal> keyingtries=1<o:p></o:p></p><p class=MsoNormal> keyexchange=ikev2<o:p></o:p></p><p class=MsoNormal> reauth=no<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>conn psk<o:p></o:p></p><p class=MsoNormal> left=172.16.55.62<o:p></o:p></p><p class=MsoNormal> leftsourceip=%config%<o:p></o:p></p><p class=MsoNormal> leftfirewall=no<o:p></o:p></p><p class=MsoNormal> leftauth=psk<o:p></o:p></p><p class=MsoNormal> leftsubnet=172.16.0.0/16<o:p></o:p></p><p class=MsoNormal> right=172.16.135.192<o:p></o:p></p><p class=MsoNormal> rightid=172.16.135.192<o:p></o:p></p><p class=MsoNormal> rightsubnet=172.16.0.0/16<o:p></o:p></p><p class=MsoNormal> rightauth=psk<o:p></o:p></p><p class=MsoNormal> esp=3des-aes-sha1-md5-modp1024<o:p></o:p></p><p class=MsoNormal> ike=3des-sha1-md5-modp1024<o:p></o:p></p><p class=MsoNormal> auto=add<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>Thanks,<o:p></o:p></p><p class=MsoNormal>Balaji<o:p></o:p></p></div></body></html>