[Serusers] NOTIFYs in loop...

[Mansur Ali Abbasi]

Hi,
 
I'm doing some testing with SER and recently noticed that some NOTIFY
activity seems to be going in an eternal loop at our server. 14 SIP NOTIFY
Requests were found to loop back and forth between host.domain.com and
w.x.y.z where host.domain.com is our server's FQDN and w.x.y.z its IP. The
extract of tcpdump output below shows how it looks like. Would greatly
appreciate if someone could help me understand what I am seeing; What can
have caused this? Could it be a result of bad routing logic?
 
 
02:19:28.720999 host.domain.com.5060 > w.x.y.z.5060:  udp 461 (DF) [tos
0x10] 

02:19:28.721020 host.domain.com.5060 > w.x.y.z.5060:  udp 584 (DF) [tos
0x10] 

02:19:28.721032 host.domain.com.5060 > w.x.y.z.5060:  udp 707 (DF) [tos
0x10] 

02:19:28.721044 host.domain.com.5060 > w.x.y.z.5060:  udp 830 (DF) [tos
0x10] 

02:19:28.721056 host.domain.com.5060 > w.x.y.z.5060:  udp 953 (DF) [tos
0x10] 

02:19:28.721068 host.domain.com.5060 > w.x.y.z.5060:  udp 1076 (DF) [tos
0x10] 

02:19:28.721081 host.domain.com.5060 > w.x.y.z.5060:  udp 1199 (DF) [tos
0x10] 

02:19:28.721093 host.domain.com.5060 > w.x.y.z.5060:  udp 1322 (DF) [tos
0x10] 

02:19:28.721107 host.domain.com.5060 > w.x.y.z.5060:  udp 1445 (DF) [tos
0x10] 

02:19:28.721135 host.domain.com.5060 > w.x.y.z.5060:  udp 1568 (frag
56776:1480 at 0+) [tos 0x10] 

02:19:28.721158 host.domain.com.5060 > w.x.y.z.5060:  udp 1691 (frag
56777:1480 at 0+) [tos 0x10] 

02:19:28.721181 host.domain.com.5060 > w.x.y.z.5060:  udp 1814 (frag
56778:1480 at 0+) [tos 0x10] 

02:19:28.721204 host.domain.com.5060 > w.x.y.z.5060:  udp 1937 (frag
56779:1480 at 0+) [tos 0x10] 

02:19:28.721225 host.domain.com.5060 > w.x.y.z.5060:  udp 2060 (frag
56780:1480 at 0+) [tos 0x10] 

02:19:28.721415 w.x.y.z.5060 > host.domain.com.5060:  udp 461 (DF) [tos
0x10] 

02:19:28.721475 w.x.y.z.5060 > host.domain.com.5060:  udp 584 (DF) [tos
0x10] 

02:19:28.721585 w.x.y.z.5060 > host.domain.com.5060:  udp 707 (DF) [tos
0x10] 

02:19:28.721704 w.x.y.z.5060 > host.domain.com.5060:  udp 830 (DF) [tos
0x10] 

02:19:28.721843 w.x.y.z.5060 > host.domain.com.5060:  udp 953 (DF) [tos
0x10] 

02:19:28.721981 w.x.y.z.5060 > host.domain.com.5060:  udp 1076 (DF) [tos
0x10] 

02:19:28.722136 w.x.y.z.5060 > host.domain.com.5060:  udp 1199 (DF) [tos
0x10] 

02:19:28.722301 w.x.y.z.5060 > host.domain.com.5060:  udp 1322 (DF) [tos
0x10] 

02:19:28.722472 w.x.y.z.5060 > host.domain.com.5060:  udp 1445 (DF) [tos
0x10] 

02:19:28.722507 w.x.y.z.5060 > host.domain.com.5060:  udp 1568 (frag
56776:96 at 0+) [tos 0x10] 

02:19:28.722824 w.x.y.z.5060 > host.domain.com.5060:  udp 1691 (frag
56777:224 at 0+) [tos 0x10] 

02:19:28.722961 w.x.y.z.5060 > host.domain.com.5060:  udp 1814 (frag
56778:344 at 0+) [tos 0x10] 

02:19:28.723165 w.x.y.z.5060 > host.domain.com.5060:  udp 1937 (frag
56779:472 at 0+) [tos 0x10]

 
 
 
Regards,
Mansur Ali Abbasi
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