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Eric Kung
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How do I open UDP port 123 thru the Cisco 1941 router

I am new in cisco, and I have one question about open UDP port 123. I have a 1941 router. I need to open UDP port 123 for 64.147.116.229 to one of my internal server (IP 192.168.0.1). Do I use the following? Thank you in advance.

permit udp 64.147.116.229 192.168.0.1 eq 123
RoutersCisco

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mrmozaffari

8/22/2022 - Mon
mrmozaffari

Correct ,But you also need to assign this access-list to an interface.
And also you have decide in which direction it has to assign.

As an example if your 64.147.116.229 is in the range for fast ethernet 0/1 and your Server 192.168.0.1 is in the range of Fast ethernet 0/0 then :

Conf t
ip access-list extended Test
exit
Interface fa0/1
access-group Test in

ctrl+z

Thats all.
mrmozaffari

Sorry i have to correct my previous syntax :

Ip access-group Test in
Eric Kung

ASKER
ic, thank you for your help mrmozaffari. for permit udp 64.147.116.229 192.168.0.1 eq 123, should the external Ip go first or internal ip? I need to establish a 2 way communication.
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mrmozaffari

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