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88 ServerIron ADX Security Guide
53-1002440-03
IACL overview
3
The fourth condition permits all packets that are not explicitly denied by the other entries. Without
this entry, the ACL would deny all incoming IPv6 traffic on the ports to which you assigned the ACL.
The following commands apply the ACL "netw" to the incoming traffic on port 1/2 and to the
incoming traffic on port 4/3.
ServerIronADX(config)# int eth 1/2
ServerIronADX(config-if-1/2)# ipv6 traffic-filter netw in
ServerIronADX(config-if-1/2)# exit
ServerIronADX(config)# int eth 4/3
ServerIronADX(config-if-4/3)# ipv6 traffic-filter netw in
ServerIronADX(config)# write memory
Here is another example:
ServerIronADX(config)# ipv6 access-list nextone
ServerIronADX(config-ipv6-access-list rtr)# deny tcp 2001:1570:21::/24
2001:1570:22::/24
ServerIronADX(config-ipv6-access-list rtr)# deny udp any range 5 6
2001:1570:22::/24
ServerIronADX(config-ipv6-access-list rtr)# permit ipv6 any any
ServerIronADX(config-ipv6-access-list rtr)# write memory
The first condition in this ACL denies TCP traffic from the 2001:1570:21::x network to the
2001:1570:22::x network.
The next condition denies UDP packets from any source with source UDP port in ranges 5 to 6 and
whose destination is to the 2001:1570:22::/24 network.
The third condition permits all packets containing source and destination addresses that are not
explicitly denied by the first two. Without this entry, the ACL would deny all incoming IPv6 traffic on
the ports to which you assign the ACL.
A show running-config command displays the following:
A show ipv6 access-list command displays the following:
The following commands apply the ACL “rtr” to the incoming traffic on ports 2/1 and 2/2.
Default and Implicit IPv6 ACL Action
The default action when no IPv6 ACLs are configured on an interface is to permit all IPv6 traffic.
However, once you configure an IPv6 ACL and apply it to an interface, the default action for that
interface is to deny all IPv6 traffic that is not explicitly permitted on the interface.
ServerIronADX(config)# show running-config
ipv6 access-list rtr
deny tcp 2001:1570:21::/24 2001:1570:22::/24
deny udp any range 5 6 2001:1570:22::/24
permit ipv6 any any
ServerIronADX(config)# sh ipv6 access-list rtr
ipv6 access-list rtr: 3 entries
deny tcp 2001:1570:21::/24 2001:1570:22::/24
deny udp any range 5 6 2001:1570:22::/24
permit ipv6 any any
ServerIronADX(config)# int eth 2/1
ServerIronADX(config-if-2/1)# ipv6 traffic-filter rtr in
ServerIronADX(config-if-2/1)# exit
ServerIronADX(config)# int eth 2/2
ServerIronADX(config-if-2/2)# ipv6 traffic-filter rtr in
ServerIronADX(config)# write memory