allowing acl to a dns address

Unanswered Question
Sep 2nd, 2008

Hi all, if I want to allow my hosts to access a certain host name, how can I do this ?

I have this problem too.
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Let me bring your attention to a specific part of the URL I posted:-

access-list 101 permit tcp host host eq telnet

access-list 101 permit tcp host host

access-list 101 permit udp host host

access-list 101 permit ip

So now lets think about DNS - typically a DNS query is UDP port 53 right?

So in URL I posted and the above capture of some of the post, a typical extended access-list you specify:-

1) Permit or Deny

2) Layer 3 IP or Layer 4 TCP/UDP - there are more options...but for this we can forget about them

3) Source network or source host

4) Source tcp/udp port number

5) Destination network or desintation host

6) Destination tcp/udp port number

I think the above explains it all.


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