From: Anand Singh (anandksi@cisco.com)
Date: Fri Oct 29 2004 - 17:45:17 GMT-3
If you have "ip domain-lookup" configured and no dns-server, the router will
broadcast for dns lookups. If you have dns server configured but not "ip
domain-lookup", it won't work. You can verify all these by using "debug ip
packet" and then mistype something in the enable mode like:
We just have "ip domain-lookup" configured:
R1#debug ip packet
IP packet debugging is on
R1#kk
Translating "kk"...domain server (255.255.255.255)
.Oct 29 13:43:11.427: IP: s=162.1.13.3 (Serial1), d=224.0.0.10, len 60, rcvd
2
.Oct 29 13:43:11.643: IP: s=162.1.13.1 (local), d=255.255.255.255 (Serial1),
len 48, sending broad/multicast
.Oct 29 13:43:11.647: IP: s=150.1.1.1 (local), d=255.255.255.255
(Loopback0), len 48, sending broad/multicast
.Oct 29 13:43:11.647: IP: s=192.10.1.1 (local), d=255.255.255.255
(Ethernet1), len 48, sending broad/multicast
-Anand
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of ccie2be
> Sent: Friday, October 29, 2004 1:29 PM
> To: Group Study
> Subject: DNS verification
>
>
> Hi guys,
>
> What does a router do if it's suppose to use DNS to resolve
> names but no DNS server address is configured?
>
> For example,
>
> R1
>
> ip domain-lookup
>
>
> Does the router send out DNS to a broadcast address? Or,
> something else?
>
> What about if the dns address was configured but not ip domain-lookup?
>
> I know on the lab if something like this were asked, I'd
> think, "easy points", but how could I, in the lab, verify
> that I didn't forget one or the other commands needed?
>
> TIA, Tim
>
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