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Extreme - Telnet Access List

Posted on 2005-04-07
Medium Priority
Last Modified: 2012-08-14
I'm looking to create an an access list to lock down telnet access to my Summit48i.

What's confusing me though, is because it is in layer 3 mode, there are a number of different IP addresses which I change often.

Is there a way of locking down ALL telnet traffic to, say, 192.168.0/24 for ALL ports on the switch, but not affecting traffic which is simply being routed through it?
Question by:jezzar
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Expert Comment

ID: 13823884

What box do you have? Cisco? If so try to assign following ACL to interface you are expect attack:

access-list 120 deny tcp any eq 23
access-list 120 permit ip any any

So it will block any telnet traffic from anywhere to any machine on 192.168.0.X network but will allow everything else.


Author Comment

ID: 13831919
It's an Extreme Switch

Expert Comment

ID: 13874045
If it is Layer 2 switch then it is impossible to block traffic on tcp port- based criteria. If it is a Layer 3 switch (router) - check manual for how to apply ACL on it. What exact model ?

Author Comment

ID: 13874261
It's layer three. 48si.

On a suddenly more important note, erm... any idea what to do if you forget the admin password?


Accepted Solution

Gen2003 earned 500 total points
ID: 13943655
Sorry, for long delay. Try to find information you need in manual for summit. If you don't have it - download from

What you need is to create access list that will allow only your computer to telnet to device:

(action) (protocol) (source ip address) (source port) (destination ip address) (destination port)

permit tcp X.X.X.X any Y.Y.Y.Y 23
deny tcp any Y.Y.Y.Y 23

where X.X.X.X is your computer's IP, Y.Y.Y.Y - is address of Summit

these are not exact syntax, check with manual.

Regarding lost password, again check manual or contact extremenetworks. As nobody here will teach you how to hack systems.


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