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Old 05-10-2008, 07:39 AM   #1
tgreaser
LQ Newbie
 
Registered: Feb 2007
Location: Morgantown, WV
Distribution: RedHat, Fedora
Posts: 24

Rep: Reputation: 16
DHCP option 82 remote-id


The newer cisco code allows you inject a string or switch host name for the agent.remote-idused hsc-2260 as the string on the switch. I see it in the sniff packets, but i cant seem to figure out how to get it in the logs..

If someone has already done so, would you post your dhcp conf .. If not.. I cant seem to find
the url / pdf / txt i had on how the log concat worked.. any direction on a good howto to
re learn how to get the data out would be very helpful..

Like 99% of the people out there i got my base conf from http://www.thtech.net/article/10
the second snip .. i did find on the net but can remember where.. (just want to give credit where credit is do)

1 last thing.. Ive been reading around so much / diff vendor stuff.. I just want to make sure the ver of isc dhcp we have
running support the agent.remote-id field im looking for .. I think it does.. but way more smarter people on this list than I.

here is my current log statement dhcp V3.0.5-RedHat


if exists agent.circuit-id
{
log ( info, concat( "Lease for ", binary-to-ascii (10, 8, ".", leased-address), " connected to interface ",
binary-to-ascii (10, 8, "/", suffix ( option agent.circuit-id, 2)), " (3750s subtract 2or4!), VLAN ",
binary-to-ascii (10, 16, "", substring( option agent.circuit-id, 2, 2)), " HWADD ",
binary-to-ascii(16, 8, ":", hardware)));

log ( info, concat ( "Switch" ,binary-to-ascii (10,8,"", substring(option agent.remote-id,9,1)),
binary-to-ascii(10,16,"",suffix(option agent.remote-id,2)),
" IP ", (binary-to-ascii(10, 8, ".", packet(12,4))),
" MAC ", (binary-to-ascii(16, 8, ":", suffix(hardware,6))),
" ROUTER ", (binary-to-ascii(10,8,".",substring(option agent.remote-id,4,4)))));

}

dhcpd.log output

May 9 07:28:40 pippin dhcpd: Lease for 10.3.3.16 connected to interface 1/4 (3750s subtract 2or4!), VLAN 3 HWADD 1:0:d:60:78:65:bb
May 9 07:28:40 pippin dhcpd: Switch4813872 IP 0.0.0.0 MAC 0:d:60:78:65:bb ROUTER 99.45.50.50

I want/need the Switch name to be
Swith hsc-2260
 
  


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