ACL entry for netbios-ss

[ambivert skill]

Hi ,

I am trying to find the difference between the line mentioned in ACL

1.deny udp any any range 135 netbios-ss

2.deny tcp any any range 135 139 .

SMB (Server Message Block) protocol is used among other things for file  sharing in Windows NT/2000/XP. In Windows NT it ran on top of NetBT  (NetBIOS over TCP/IP), which used the famous ports 137, 138 (UDP) and  139 (TCP).

so what is the special purpose of first ACL line.

Thanks

[cadet alain · Accepted solution]

Hi,

netbios-ss is port 139 tcp and udp so these are the same lines except for the transport protocol.

Regards

Alain

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[ambivert skill]

Thanks for your reply suppose if these lines are for TCP only then it mean the same thing

1.deny tcp any any range 135 netbios-ss

2.deny tcp any any range 135 139 .

Regards

Ambivert