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Cisco ACL Help

Posted on 2011-02-15
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Last Modified: 2012-05-11
I need a sanity check. I want to configure so that the server is only accessible from two other VLANs. For example, the server IP address is 10.4.0.26; the other VLAN requiring access is 10.4.12.0/24 and 10.4.17.0/24.

ip access-list extended SECURE
permit icmp any any
permit ip 10.4.12.0 0.0.0.255 host 10.4.0.26
permit ip 10.4.17.0 0.0.0.255 host 10.4.0.26
permit ip 10.4.0.0 0.0.0.255 host 10.4.0.26
deny ip any any

Would I apply this ACL on the interface that 10.4.0.26 is attached?
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Question by:pitchford
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4 Comments
 
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Accepted Solution

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mikegatti earned 500 total points
ID: 34898442
you could use this acl in the outbound direction of the vlan interface. this would also block all other traffic destined to this vlan. i would add a log at the end of the last deny so that you can see if anything else is being denied.

ip access-list extended SECURE
permit icmp any any
permit ip 10.4.12.0 0.0.0.255 host 10.4.0.26
permit ip 10.4.17.0 0.0.0.255 host 10.4.0.26
permit ip 10.4.0.0 0.0.0.255 host 10.4.0.26
deny ip any any log

interface vlan XXX
 ip address 10.4.0.x 255.255.255.0
 ip access-group SECURE out
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Expert Comment

by:GridLock137
ID: 34898956
extended ACLs are best to configure closer to the destination of where the packets are trying to get to as opposed to standard ACLs need to be closer to the source being they tend to drop alot of packets. so closer to the server would be best.
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Author Comment

by:pitchford
ID: 34930682
Mike, the acl you provided would deny all other traffic to that vlan. I'm still not satisfied with the setup... I will post my final config...
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Author Closing Comment

by:pitchford
ID: 34930814
Not exactly what I'm looking for, but very close.
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