Check the connections TCP & UDP host through ACL

Hello!

I use ACL to control TCP UDP & connections pass through my router (C805 & C2500). I plan to control of the host, but after I have created a new ACL that and add it on IP Access-Group of my Serial interface, the acl that I add before who is used to control the connections TCP & UDP is removed because of an ACL. How can I handle this?

What you have is a standard access list, which would block anything with the source 127.0.0.1 address and an access list more extended negates several types of traffic.

To combine I would rewrite the access list standard as a broader access list:

access-list 100 deny ip 127.0.0.1 host everything

who deny packets whose source 127.0.0.1 address.

I would put rewriting stated as first statement in the new list access followed by others which would give you this:

Note 100 access list refuse the specific host

access-list 100 deny ip 127.0.0.1 host everything

Access-list 100 remark block number TCP and UDP ports

access list 100 permit tcp any any eq www

access-list 100 permit tcp a whole Workbench

access-list 100 tcp refuse any any eq 135

access-list 100 tcp refuse any any eq 445

access-list 100 tcp refuse any any eq 593

access-list 100 deny udp any any eq 135

access-list 100 deny udp any any eq tftp

access-list 100 deny udp any any eq netbios-ns

access ip-list 100 permit a whole

That should do it.

HTH

Rick

Tags: Cisco Security

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