Access list to Block ports

Answered Question
Apr 27th, 2007

Hi ,

I have congfired a access-list on my Internet router 3845 as attached to block ports 1720 & 5060 , but when i apply it on the intended interface the BGP state goes down.Is my configuration correct ? Also suggest .

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Correct Answer by mohammedmahmoud about 9 years 8 months ago

Hi there,

BGP uses TCP port 179, accordingly you must permit it on your access-list, and don't forget the access-list has an implicit deny in the end, so you should add permit ip any any at the end of your ACL after denying what you want to deny to permit the rest of the traffic.

HTH, please rate if it does help,

Mohammed Mahmoud.

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Correct Answer
mohammedmahmoud Fri, 04/27/2007 - 04:25

Hi there,

BGP uses TCP port 179, accordingly you must permit it on your access-list, and don't forget the access-list has an implicit deny in the end, so you should add permit ip any any at the end of your ACL after denying what you want to deny to permit the rest of the traffic.

HTH, please rate if it does help,

Mohammed Mahmoud.

royalblues Fri, 04/27/2007 - 04:33

Your access-list does not carry any permit statemets.

include access-list 102 permit ip any any and check

HTH,

Narayan

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