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Allowing RDP through Cisco router

Posted on 2008-10-28
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Last Modified: 2011-10-19
ok, simply put we have a vendor that needs to have access to internal server, i created a NAT rule to allow 3389 traffic to go to that server, but it lets everyone to it, i want to restrict access to that server based on thier public ip..attached is the config..thanks
cobrun.txt
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Question by:jasonmichel
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7 Comments
 
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JFrederick29 earned 2000 total points
ID: 22821272
You can apply an access-list to the WAN interface that only allows RDP from your vendor (x.x.x.x).

conf t
ip access-list extended internet-in
permit tcp host x.x.x.x host 70.62.43.150 eq 3389  <--where x.x.x.x is the public IP of your vendor
deny tcp any host 70.62.43.150 eq 3389
permit ip any any

int g0/0
ip access-group internet-in in
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Author Comment

by:jasonmichel
ID: 22821397
i am going to get ahold of vendor to test...but i think that will work..thanks, just another quick question...if i wanted to add another host to be allowed to get to that server how do i add a sequence to the NACL?  

thanks
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Expert Comment

by:JFrederick29
ID: 22821431
If you do a "show access-list internet-in", you will see line numbers next to the access-list.

For example:

10 permit tcp host x.x.x.x host 70.62.43.150 eq 3389
20 deny tcp any host 70.62.43.150 eq 3389
30 permit ip any any

Simply add the new entry with a line number to insert the permit before the deny.

conf t
ip access-list ext internet-in
12 permit tcp host y.y.y.y host 70.62.43.150 eq 3389    <--where y.y.y.y is the new vendor IP

Your new access would look like this:

10 permit tcp host x.x.x.x host 70.62.43.150 eq 3389
12 permit tcp host y.y.y.y host 70.62.43.150 eq 3389
20 deny tcp any host 70.62.43.150 eq 3389
30 permit ip any any
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Author Comment

by:jasonmichel
ID: 22821464
i def want the sequence number to be lower  than the deny sequence number correct?
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Expert Comment

by:JFrederick29
ID: 22821483
Yes, the permit needs to be before the deny so you can choose any number between 10 and 20 (11-19).
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Author Comment

by:jasonmichel
ID: 22821638
added my home ip to it and tested..it worked..thanks for the simple yet great instructions
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Author Closing Comment

by:jasonmichel
ID: 31510710
thanks for the help, you made it very simple to understand and it did exactly what i needed it to
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