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Senthil_Kumar_N's avatar
Senthil_Kumar_N
Icon for Nimbostratus rankNimbostratus
Oct 03, 2012

Multiple request sent after each 300 seconds

We have a architecture like, cluster enabled weblogic server with F5 load balancer i.e   F5 between our application server and the database server. And we have this setup for more than a year.   ...
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nitass's avatar
nitass
Icon for Employee rankEmployee
Oct 04, 2012
I am not sure of what is mean " shouldn't sequence number in packet be same".. sorry, could you please explain little bit? i think retransmission packet will use same tcp sequence number and just curious if database server still process packet repeatedly.

e.g. 

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:23
   ip protocol 6
}
[root@ve10:Active] config  b pool foo list
pool foo {
   members 200.200.200.101:23 {}
}
[root@ve10:Active] config  b self 200.200.200.10 list
self 200.200.200.10 {
   netmask 255.255.255.0
   vlan internal
   allow default
}

 retransmission packet with same sequence number i.e. 3199438433

[root@ve10:Active] config  tcpdump -nni 0.0 -S host 200.200.200.101 and port 23
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on 0.0, link-type EN10MB (Ethernet), capture size 108 bytes
21:27:37.975148 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:27:39.175144 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:27:41.375453 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:27:45.575459 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:27:53.775557 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:28:09.975442 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:28:42.175367 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622 
21:29:46.175193 IP 200.200.200.10.55822 > 200.200.200.101.23: P 3199438433:3199438434(1) ack 2240270435 win 4622