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Webcast-Catalyst9k
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Deny DNS-Server advertisement from DHCP server?

Hi,

I'm configuring an 1841 router to also act as a DHCP server for connected DHCP client PCs (FE0/0).

The router itself should first ask DNS server 192.168.1.1 (FE0/0/0) for an address resolution and if that fails 192.168.2.1 (FE0/1).

The problem is, that the the interface to the second DNS server (FE0/1) gets it's IP also from a DHCP sever and this DHCP sever advertises a default route and a name server statement to the router. The default route is not the problem because of the bad AD of 254, but the DNS server advertisement prevents the router from first asking DNS 192.168.1.1 (FE0/0/0).

The DNS server advertisement on the DHCP client interface (FE0/1) is always the same IP, so it would be no problem to configure it as a static entry but how do I prevent the router from learing the DNS statement from the DHCP server on that interface?

Sadly the IP on that interface can't be configured as a static entry.

Thanks a lot!

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