Multiple dhcrelay setup causing multiple duplicate DHCP requests

budiw at rootbox.or.id budiw at rootbox.or.id
Sat Aug 14 21:38:50 UTC 2010


>
>
> Hi guys,
>
> I need some assistance with a multiple dhcrelay setup with failover dhcpd
> servers.
> The problem I'm getting is multiple duplicate dhcp requests being received
> by the dhcpd servers (which is filling up the disk very quickly on the
> server).
>
> Here is the log from one of the dhcp servers showing the result:
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPREQUEST for 10.1.70.185 from
> 00:0c:29:42:f1:1b via 10.1.70.1
> Jul 30 11:56:31 alns0 dhcpd: DHCPACK on 10.1.70.185 to 00:0c:29:42:f1:1b
> via 10.1.70.1
>
> The network is configured like this:
>
>   [ dhcpd1 ]
>        |
>  eth0/vlan120
> [ fw1/dhcrelay ]
>      eth5
>        |
>      eth5
> [ fw2/dhcrelay ]
>  eth0/vlan120
>        |
>    [ dhcpd2 ]
>
> The configuration on the dhcrelays is like this:
>
> /usr/sbin/dhcrelay3 -q -i eth0 -i eth1 -i vlan1 -i vlan120 -i vlan140 -i
> vlan150 -i vlan151 -i vlan170 dhcpd1 dhcpd2 (actually have IPs in here)
>

I'm having same situation. On my dhcpd servers showed logs like this.
Except, the ip's is from all the dhcrelay (I have 6 dhcrelay).
Other than some logs that get bigger and bigger, there's no another effect
I presume. CMIIW.




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