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Forum Discussion

Julian_Grunnell's avatar
Julian_Grunnell
Icon for Nimbostratus rankNimbostratus
Jul 11, 2008

LINK::vlan_id + tcpdump

Hi - hoping there's a simple answer to this, but I was mucking around with the iRule that "when CLIENT_ACCEPTED" logs the vlan_id via [LINK::vlan_id], this appears to work BUT why does the vlan_id get...
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JRahm's avatar
JRahm
Icon for Admin rankAdmin
Jul 11, 2008
I'm on 9.4.3 HF2, and I don't see that issue. Perhaps one of your vlanID's overlaps the vlangroupID, and that's why the locally-unique bit is being set? Anyway, you can strip that bit off: 

 
 when CLIENT_ACCEPTED { 
   log local0. "VLAN ID as is: [LINK::vlan_id]" 
   log local0. "VLAN ID as desired: [expr 0x[format %x [LINK::vlan_id]] & 0xdfff]" 
 } 
  
 Here's the log output from my test box: 
  
 Jul 11 09:11:12  Rule vlanidtest-rule: VLAN ID as is: 12285 
 Jul 11 09:11:12  Rule vlanidtest-rule: VLAN ID as desired: 4093