Many DHCPrequests in log

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Patrick de Brabander

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Many DHCPrequests in log

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Hi,

I'm seeing lately a lot of messages in /var/log/messages



Jun  3 10:48:31 domain dhclient[12554]: DHCPREQUEST on eno1 to 10.160.x.x port 67 (xid=0x4badb5ab)

Jun  3 10:48:49 domain dhclient[12554]: DHCPREQUEST on eno1 to 10.160.x.x port 67 (xid=0x4badb5ab)

Jun  3 10:49:02 domain dhclient[12554]: DHCPREQUEST on eno1 to 10.160.x.x port 67 (xid=0x4badb5ab)

Jun  3 10:49:22 domain dhclient[12554]: DHCPREQUEST on eno1 to 10.160.x.x port 67 (xid=0x4badb5ab)

what is causing this and how to resolve ?

In DHCP Server

Thursday, June 04 2020, 06:06 PM

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Nick Howitt

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Friday, June 05 2020, 11:52 AM - #Permalink
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It might not be funny. I may have created it myself, but this is going back a long time.
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Patrick de Brabander

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Friday, June 05 2020, 09:55 AM - #Permalink
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Hi Nick,

The funny thing is that i don't have the file /etc/dhcp/dhclient.conf
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Nick Howitt

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Thursday, June 04 2020, 06:43 PM - #Permalink
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That should be on you external interface, which is presumably set to DHCP. I used to have that problem on cable. The problem was that when you request an IP address you request it on 255.255.255.255. The DHCP server responds with, among other things, the IP address of the server giving the lease. I can't remember the details, but that server would never respond, so I'd get those messages from when DHCP started renewing (with about half the lease time remaining) until it expired when it would do a broadcast. I got round it by putting:
supersede dhcp-server-identifier 255.255.255.255;
in /etc/dhcp/dhclient.conf. I am not sure if anything needs to be restarted.
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