keyword established

I read the book from the PSAB SECUR by Lammle and there this config:

access-list 110 tcp any refuse a Workbench

Allow Access - list 110 tcp a whole

the interface s0/0

Access-group 110

He says that this does not leave anyone "SYN" in the network, but I think it is the otherway autour. I'm sure this will help anyone outside of SYN, but never ACK or RST in the network, essentially denying traffic anyway.

Am I wrong?

You are right, Mr President.

The first line denies all TCP packets have bits ACK or RST set (e.g. SYN + ACK, ACK, ACK + RST). He made friezer deny packets with only the SYN bit set.

The second line allows TCP SYN requests!

TCP traffic initiated from outside and the cabbage in reconciliation of the interface Serial0/0 will never be able to complete the three-way handshake to configure a session but the third part of the handshake is an incoming ACK, who deny this first line.

So, indeed, all incoming TCP traffic will be refused, as you said.

If the goal was to deny all incoming TCP traffic in the first place, it would take a single ACL line:

access-list 110 tcp refuse a whole

interface Serial0/0

IP access-group 110 to

And if the goal was to restrict the direction in which TCP sessions could be undertaken, a more useful ACL would be:

access-list 110 permit tcp a whole Workbench

access-list 110 tcp refuse a whole

and apply it either entering:

interface Serial0/0

IP access-group 110 to

or outgoing:

interface Serial0/0

IP access-group out 110

Depending on where you want the sessions came from. (Assuming that there is no other ACL coming into play that affect the end of the three-way handshake).

I hope this helps.

Tags: Cisco Security

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