Forum Discussion

John_Masgalas_4's avatar
John_Masgalas_4
Icon for Nimbostratus rankNimbostratus
Jun 19, 2008

iRule for persistence table entries

We are load balancing 5 terminal servers and using the F5 persistence table to keep track of sessions. We have run into an issue where users that log in from a Linux based rdp client are getting a per...
application delivery
dev
devops
iRules
JRahm's avatar
JRahm
Icon for Admin rankAdmin
Jun 25, 2008
OK, I tested this and it is working for me: 

  
  when CLIENT_ACCEPTED {  
    TCP::collect  
  }  
  when CLIENT_DATA {  
    TCP::collect 25  
    binary scan [TCP::payload] x11a* msrdp  
    log local0. "Contents after binary scan: $msrdp"  
    if { [string equal -nocase -length 17 $msrdp "cookie: mstshash="] } {  
      set msrdp [string range $msrdp 17 end]  
      set len [string first "\n" $msrdp]  
      if { $len == -1 } {  
        TCP::collect  
        return  
      }  
      if { $msrdp contains "@" } {  
        if { $len > 5 } {  
          incr len -1  
   log local0. "Data Persisting on: [getfield $msrdp "@" 1]"  
          persist uie [getfield $msrdp "@" 1]  
        } else { persist uie $msrdp }  
      }  
    }  
    TCP::release  
  }

Log entries:

Jun 25 15:56:46 tmm tmm[1695]: Rule rdp_persist : Contents after binary scan: Cookie: mstshash=elah@doma

Jun 25 15:56:46 tmm tmm[1695]: Rule rdp_persist : Data Persisting on: elah

Persistence Data:

PERSISTENT CONNECTIONS

| Mode universal Value elah

| virtual xx.xx.xx.xx:3389 node xx.xx.xx.xx:3389 age 29sec