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
weikiiroAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

mrmozaffariCommented:
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.
mrmozaffariCommented:
Sorry i have to correct my previous syntax :

Ip access-group Test in
weikiiroAuthor Commented:
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.
mrmozaffariCommented:
You did it correctly ,Why ?
Oh just one :
To define a correct access list ; Your syntax is not correct,
Don't Forget Wild card or "Host"
Correct is :

permit udp 64.147.116.229 0.0.0.0 192.168.0.1 0.0.0.0 eq 123

OR

permit udp Host 64.147.116.229 0.0.0.0 Host 192.168.0.1 eq 123

They are same.



It is the structure of the Extended ACLs :

Permit/Deny Protocol [Source] [Destination]
or
for permit Rule :

Permit [protocol] [Source address] [Wild card mask] [eq] [port number] [Destination Address] [Wild card mask] [eq] [port number]

Best Regards,
Mozaffari.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.