Applying ACL on Serial interface in "IN" direction
I am trying to apply extended access-list on serial interface in the IN direction allowing only a certain network on the remote side to access a single host in my network, but the problem which I am facing is that all my outgoing traffic is getting blocked. What can be the probable reason for this. Please help me out of this.
Re: Applying ACL on Serial interface in "IN" direction
The problem could be with your inbound access-list blocking all your return traffic. Note that an ACL has an implicit deny at the end. So you need to deny all specific things you want to deny FIRST and then at the END, specify a permit any to permit the rest of the traffic.
Your ACL should look like this.
access-list 101 deny ip host
access-list 101 permit ip any any
where x.x.x.x is the host in your local network.
y.y.y.y is the network address of the remote side
z.z.z.z is the wild card mask matching y.y.y.y
The last line is needed to permit the return traffic (for your outgoing traffic).
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