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How to Allow POP and IMAP through Cisco 5505 from specific public outside IP addresses

Posted on 2009-05-15
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Last Modified: 2012-05-07
Hi all -

Please advise commands to allow pop and imap connections in to Exchange server from two public ip address only.

Many thanks
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Question by:ZenRoots
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Expert Comment

by:JFrederick29
ID: 24397478
Instead of this which is probably what you currently have (or something similar):

access-list outside_access_in extended permit tcp any interface outside eq pop3
access-list outside_access_in extended permit tcp any interface outside eq imap

Do this instead:

access-list outside_access_in extended permit tcp host x.x.x.x interface outside eq pop3
access-list outside_access_in extended permit tcp host y.y.y.y interface outside eq imap

Remove the existing rules allowing "any".
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Author Comment

by:ZenRoots
ID: 24398164

Thanks JFrederick29

This seems to be what I want... please confirm the following syntax breakdown:

access-list outside_access_in extended permit tcp host x.x.x.x interface outside eq pop3
 
The access-list name = outside_access_in
Type = extended
Rule = permit
tcp protocol = pop3
IP address of external host = x.x.x.x
interface name = outside
eq = protocol (default port)

In "plain" english this allows external host x.x.x.x access via the ASA's outside interface using the pop3 port (110)


this access-list is used in conjunction with:
 
static (inside,outside) tcp interface pop3 xx.xx.xx.xx pop3 netmask 255.255.255.255

Is this interpertation correct?

Many thanks,
ZenRoots
 
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JFrederick29 earned 250 total points
ID: 24398184
Yes, correct, exactly right.
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LVL 43

Expert Comment

by:JFrederick29
ID: 24398193
Just remember to remove the old rules allowing "any" once the new rules are in place.
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Author Closing Comment

by:ZenRoots
ID: 31582003
Thanks JFrederick29   Very concise and clear anwsers.  
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