Traffic Internet PIN for router ACL

Hello, I create a router-on-a-stick typical configuration where remote locations running IOS Cisco direct Internet traffic out through an IPSec tunnel that ends on an ASA5510. I'm 99% it and can't seem to move between the rays and the Internet. I'm looking for advice on how to configure properly the ACL entering the router WAN interfaces spoke.

My question is, what I specifically authorize the return of Internet traffic in the router speaks ACL? I was under the impression that what allows the Hub ASA IPSec traffic would include traffic Internet has hairpined through the ASA and I wouldn't need a specific ACL entry to addresses of Internet sources.

The router has spoken, I work now is a 3620 running IOS 12.3.26. When I configure the ACL entering on the WAN Interface to allow only the esp/isakmp Hub ASA, I'm not able to receive traffic from the Internet. If I remove the inbound ACL everything works fine. Here are the current incoming ACL from the laboratory network router:

access-list authorized note 130 incoming WAN connections

Note access-list 130 IPSec

Note LAN Access - list 130 subnets

access-list 130 allow ip 192.168.75.0 0.0.0.255 192.168.168.0 0.0.0.255

access-list 130 allow ip 192.168.50.0 0.0.0.255 192.168.168.0 0.0.0.255

access-list 130 allow ip 10.199.199.0 0.0.0.255 192.168.168.0 0.0.0.255

Note access-list 130 HUB ASA

access-list 130 permit udp host 172.16.1.4 host 172.16.1.21 eq non500-isakmp

access-list 130 permit udp host 172.16.1.4 host 172.16.1.21 eq isakmp

access-list 130 allow esp 172.16.1.4 host 172.16.1.21

access-list 130 allow host 172.16.1.4 ahp 172.16.1.21

Note access-list 130 NTP to the router

access-list 130 permit udp host 192.43.244.18 ntp host 172.16.1.21 eq eq ntp

access-list 130 authorized note ICMP traffic

access-list 130 permit icmp any echo host 172.16.1.21

access-list 130 permit icmp any any echo response

access-list 130 permit icmp any any source-quench

access-list 130 permit icmp any a package-too-big

access-list 130 allow icmp all once exceed

access-list 130 refuse icmp a whole

access-list 130 authorized note circulation of Managment

Note 130-list of access allow ssh

access list 130 permit tcp any any eq 22

With the list above applied inbound access on my WAN Interface, internal hosts are able to ping Internet addresses (allowing a response to ICMP echo) but cannot browse the Internet.

Should I enable a firewall on the router policy to allow the return of the Internet traffic? I thought that rule of ESP permits that would cover.

Any help is appreciated!

Dan

Dan

Unless you're running the IOS Firewall feature on your spoke routers then the router is unable to keep the State of outbound connections. So yes, you will need to also allow the traffic unencrypted in your inbound ACLs on the WAN interface because once the traffic is decrypted, it is then checked against the acl on the interface, see this link to order operations.

http://www.Cisco.com/en/us/Tech/tk648/tk361/technologies_tech_note09186a0080133ddd.shtml

On ASA/Pix firewalls you can tell the device to check against the acl on the external interface once that traffic has been decrypted with the command "sysopt connection" but I'm not aware of a similar option for IOS.

Jon

Tags: Cisco Security

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