Title: Access-list Problem with UDP Port 53
I am having a problem with an access-list on a 2600 router. It used for the clients T1 connection.
the access-list as follows:
access-list 100 deny ip 10.0.0.0 0.255.255.255 any
access-list 100 deny ip 172.16.128.0 0.0.15.255 any
access
Access-list Problem with UDP Port 53Could you clarify your network
configuration? Is the 2600 at your location and connected to the client via
the T-1 on serX? I just did some similar but even more restrictive acl's at
my job.
Tim
""Richie, Nathan"" <[EMAIL PROTECTED]> wrote in message
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Title: Access-list Problem with UDP Port 53
Try the followin:
access-list 100
permit udp any eq domain any
DNS queries go out on a dynamic
UDP source port and the destination UDP port is 53. On the response to the DNS
query, the UDP datagram is source UDP port 53, and the
destination
Title: RE: Access-list Problem with UDP Port 53
Correct, when you make a tcp or udp request on a known port (dns,
smtp, ftp, etc, check http://www.isi.edu/in-notes/iana/assignments/port-numbers for
a list), the response from the destination is always (supposed to be always)
returned on a
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