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<p class="MsoNormal"><span lang="NO-BOK">Hello!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NO-BOK"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="NO-BOK"><o:p> </o:p></span></p>
<p class="MsoNormal">After proxying a REGISTER from a WebRTC client to our SIP backend, the backend starts sending keepalives. Every 30 seconds I get a log entry in Kamailio saying: “INFO: stun [kam_stun.c:169]: stun_parse_header(): INFO: stun_parse_header:
incomplete header of STUN message”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Here's one such packet:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">No. Time Source Destination Protocol Length Info<o:p></o:p></p>
<p class="MsoNormal"> 1 0.000000 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP 60 5060 ? 15060 Len=4<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Frame 1: 60 bytes on wire (480 bits), 60 bytes captured (480 bits)<o:p></o:p></p>
<p class="MsoNormal">Ethernet II, Src: JuniperN_4f:3f:f0 (40:a6:77:4f:3f:f0), Dst: 02:81:64:58:cf:d1 (02:81:64:58:cf:d1)<o:p></o:p></p>
<p class="MsoNormal">Internet Protocol Version 4, Src: xxx.xxx.xxx.xxx, Dst: yyy.yyy.yyy.yyy<o:p></o:p></p>
<p class="MsoNormal"> 0100 .... = Version: 4<o:p></o:p></p>
<p class="MsoNormal"> .... 0101 = Header Length: 20 bytes (5)<o:p></o:p></p>
<p class="MsoNormal"> Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)<o:p></o:p></p>
<p class="MsoNormal"> Total Length: 32<o:p></o:p></p>
<p class="MsoNormal"> Identification: 0x5bf5 (23541)<o:p></o:p></p>
<p class="MsoNormal"> Flags: 0x4000, Don't fragment<o:p></o:p></p>
<p class="MsoNormal"> Time to live: 56<o:p></o:p></p>
<p class="MsoNormal"> Protocol: UDP (17)<o:p></o:p></p>
<p class="MsoNormal"> Header checksum: 0x2fc3 [validation disabled]<o:p></o:p></p>
<p class="MsoNormal"> [Header checksum status: Unverified]<o:p></o:p></p>
<p class="MsoNormal"> Source: xxx.xxx.xxx.xxx<o:p></o:p></p>
<p class="MsoNormal"> Destination: yyy.yyy.yyy.yyy<o:p></o:p></p>
<p class="MsoNormal">User Datagram Protocol, Src Port: 5060, Dst Port: 15060<o:p></o:p></p>
<p class="MsoNormal"> Source Port: 5060<o:p></o:p></p>
<p class="MsoNormal"> Destination Port: 15060<o:p></o:p></p>
<p class="MsoNormal"> Length: 12<o:p></o:p></p>
<p class="MsoNormal"> Checksum: 0xfa28 [unverified]<o:p></o:p></p>
<p class="MsoNormal"> [Checksum Status: Unverified]<o:p></o:p></p>
<p class="MsoNormal"> [Stream index: 0]<o:p></o:p></p>
<p class="MsoNormal">Data (4 bytes)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">0000 00 00 00 00 ....<o:p></o:p></p>
<p class="MsoNormal"> Data: 00000000<o:p></o:p></p>
<p class="MsoNormal"> [Length: 4]<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I found this in kam_stun.c:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">static int stun_parse_header(struct stun_msg* req, USHORT_T* error_code)<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> if (sizeof(req->hdr) > req->msg.buf.len) {<o:p></o:p></p>
<p class="MsoNormal"> /* the received message does not contain whole header */<o:p></o:p></p>
<p class="MsoNormal"> LOG(L_INFO, "INFO: stun_parse_header: incomplete header of STUN message\n");<o:p></o:p></p>
<p class="MsoNormal"> /* Any better solution? IMHO it's not possible to send error response<o:p></o:p></p>
<p class="MsoNormal"> * because the transaction ID is not available.<o:p></o:p></p>
<p class="MsoNormal"> */<o:p></o:p></p>
<p class="MsoNormal"> return FATAL_ERROR;<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>
<p class="MsoNormal">Could someone please explain what’s wrong?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="NO-BOK" style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black;mso-fareast-language:NO-BOK">Med vennlig hilsen<br>
<b>Pan B. Christensen</b><br>
Utvikler<br>
<br>
Phonect AS <br>
Brugata 19, PB 9156 Grønland, N-0133 Oslo, Norway<br>
E-post: </span><span lang="NO-BOK" style="font-size:9.0pt;font-family:"Helvetica",sans-serif;mso-fareast-language:NO-BOK"><a href="mailto:pan.christensen@phonect.no"><span style="color:#0563C1">pan.christensen@phonect.no</span></a><br>
Mobil: 41 88 88 00<br>
<br>
<span style="color:black"><br>
</span></span><span lang="NO-BOK"><a href="http://www.phonect.no/"><span style="color:windowtext;mso-fareast-language:NO-BOK;text-decoration:none"><img border="0" width="159" height="51" style="width:1.6562in;height:.5312in" id="Picture_x0020_16" src="cid:image002.png@01D3F740.A662D960" alt="cid:image007.png@01D3A0E8.376921D0"></span></a></span><span lang="NO-BOK" style="mso-fareast-language:NO-BOK"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NO-BOK"><a href="https://www.facebook.com/phonectno"><span style="color:windowtext;mso-fareast-language:NO-BOK;text-decoration:none"><img border="0" width="21" height="21" style="width:.2187in;height:.2187in" id="Picture_x0020_1" src="cid:image003.png@01D3F73F.197625D0" alt="facebook_2"></span></a></span><span lang="NO-BOK" style="color:black;mso-fareast-language:NO-BOK"> </span><span lang="NO-BOK"><a href="https://www.linkedin.com/company/44983?trk=tyah&trkInfo=clickedVertical%3Acompany%2CentityType%3AentityHistoryName%2CclickedEntityId%3Acompany_company_44983%2Cidx%3A0"><span style="font-size:10.5pt;color:black;mso-fareast-language:NO-BOK;text-decoration:none"><img border="0" width="21" height="21" style="width:.2187in;height:.2187in" id="Picture_x0020_2" src="cid:image004.png@01D3F73F.197625D0" alt="LinkedIn_logo_initials (1)"></span></a></span><span lang="NO-BOK" style="font-size:10.5pt;color:#1F497D;mso-fareast-language:NO-BOK"> </span><span lang="NO-BOK" style="mso-fareast-language:NO-BOK"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="NO-BOK"><o:p> </o:p></span></p>
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