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eq domain? 1

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Hondy

Hondy

Technical User
Mar 3, 2003
864
GB
quick one - on an access list, what does "eq domain" mean?

e.g.

access-list myname permit tcp 1.1.1.1 255.255.255.0 any eq domain

Thanks
 
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For common layer-4 protocols the PIX (and other Cisco devices) knows the port numbers and uses 'friendly' names instead of the actual port number. In this case it references DNS over TCP (port 53).

In the acl listed it means permit TCP from the source host 1.1.1.1 to anywhere where the destination TCP port is 53.

Andy
 
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ah - I would have thought the friendly name would be "DNS", I saw the eq HTTP etc, but "domain" had me confused, nice one!
 
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