Forum Discussion
collinz1_17223
Nimbostratus
NimbostratusiRule using findstr in TCP payload
I am trying to create an irule that will search the TCP response from a server for the userData: value and them persist based on that. The irule is below, which i have associated with a Universal persistence profile, but when i try to initiate a connection, no connection is being established to one of the load balanced servers. If i remove the persistence profile i am load balanced fine:
when SERVER_CONNECTED {
TCP::collect 1500
}
when SERVER_DATA {
set usrid [findstr [TCP::payload] "userData:" 9]
if {$usrid ne ""} {
persist uie $usrid
}
}
hooleylistCirrostratus
Are you sure the failure is that no serverside connection is attempted or established? The iRule shouldn't take any effect until then.
Can you add TCP::release to SERVER_DATA and retest?
http://devcentral.f5.com/wiki/default.aspx/iRules/tcp__release
Aaron
collinz1_17223It appears that if i reduce the TCP::collect value, i get connected. However i only get connected if i set the value to 19 or below:TCP::collect 19
Which is fine as far as connecting goes, however i guess this means that the irule is only collecting 19 bytes of data, which isn't enough to find my search string.