Configuration Guide User guide

1760 FastIron Configuration Guide
53-1002494-02
Configuring an IPv6 ACL
• If you want to secure access in environments with many users, you might want to configure
ACLs that consist of explicit deny entries, then add an entry to permit all access to the end of
each ACL. The permit entry permits packets that are not denied by the deny entries.
Every IPv6 ACL has the following implicit conditions as its last match conditions.
• permit icmp any any nd-na – Allows ICMP neighbor discovery acknowledgements.
• permit icmp any any nd-ns – Allows ICMP neighbor discovery solicitations.
• deny ipv6 any any – Denies IPv6 traffic. You must enter a permit ipv6 any any as the last
statement in the access-list if you want to permit IPv6 traffic that were not denied by the
previous statements.
NOTE
If an IPv6 ACL has the implicit deny condition, make sure it also permits the IPv6 link-local address,
in addition to the global unicast address. Otherwise, routing protocols such as OSPF will not work.
To view the link-local address, use the show ipv6 interface command.
The conditions are applied in the order shown above, with deny ipv6 any any as the last condition
applied.
For example, if you want to deny ICMP neighbor discovery acknowledgement, then permit any
remaining IPv6 traffic, enter commands such as the following.
The first permit statement permits ICMP traffic from hosts in the 2000:2383:e0bb::x network to
hosts in the 2001:3782::x network.
The deny statement denies ICMP neighbor discovery acknowledgement.
The last entry permits all packets that are not explicitly denied by the other entries. Without this
entry, the ACL will deny all incoming IPv6 traffic on the ports to which you assigned the ACL.
Furthermore, if you add the statement deny icmp any any in the access list, then all neighbor
discovery messages will be denied. You must explicitly enter the permit icmp any any nd-na and
permit icmp any any nd-ns statements just before the deny icmp statement if you want the ACLs to
permit neighbor discovery as in the example below.
Brocade(config)# ipv6 access-list netw
Brocade(config-ipv6-access-list-netw)# permit icmp 2000:2383:e0bb::/64
2001:3782::/64
Brocade(config-ipv6-access-list-netw)# deny icmp any any nd-na
Brocade(config-ipv6-access-list-netw)# permit ipv6 any any
Brocade(config)#ipv6 access-list netw
Brocade(config-ipv6-access-list-netw)#permit icmp 2000:2383:e0bb::/64
2001:3782::/64
Brocade(config-ipv6-access-list-netw)#permit icmp any any nd-na
Brocade(config-ipv6-access-list-netw)#permit icmp any any nd-ns
Brocade(config-ipv6-access-list-netw)#deny icmp any any
Brocade(config-ipv6-access-list-netw)#permit ipv6 any any