Brocade Virtual ADX Security Guide (Supporting ADX v03.1.00) - Manual (Page 62)

50 Brocade Virtual ADX Security Guide
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IPv6 ACL overview
3
NOTE
TCP and UDP filters will be matched only if they are listed as the first option in the extension header.
For TCP and UDP, you also can specify a comparison operator and port name or number. For
example, you can configure a policy to block web access to a specific website by denying all TCP
port 80 (HTTP) packets from a specified source IPv6 address to the website’s IPv6 address.
This chapter contains the following sections:
• “Configuring an IPv6 ACL” on page 50
• “Applying an IPv6 ACL to an interface” on page 55
• “Displaying ACLs” on page 55
Configuration notes
• Either IPv6 must be enabled globally or an IPV6 address must be configured on an interface
before IPv6 ACLs can be configured.
• An IPv6 ACL can include up to 1024 entries or statements.
• Only named ACLs are supported.
• Only Inbound ACLs are supported.
• 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.
• You cannot disable IPv6 on an interface to which an ACL is bound. Attempting to do so will
cause the system to return the following error message.
Virtual ADX(config-if-e1000-7)#no ipv6 enable
Error: Port 7 has IPv6 ACL configured. Cannot disable IPv6
To disable IPv6, first remove the ACL from the interface.
Configuring an IPv6 ACL
To configure an IPv6 ACL, do the following:
1. Create the IPv6 ACL.
2. Apply the IPv6 ACL to the interface.
Example configurations
To configure an access list that blocks all Telnet traffic received on port 1/1 from IPv6 host
2001:db8:2382:e0bb::2, enter the following commands.
Virtual ADX(config)#ipv6 access-list fdry
Virtual ADX(config-ipv6-access-list-fdry)#deny tcp host 2001:db8:2382:e0bb:
:2 any eq telnet
Virtual ADX(config-ipv6-access-list-fdry)#permit ipv6 any any
Virtual ADX(config-ipv6-access-list-fdry)#exit
Virtual ADX(config)#int ethernet 1/1
Virtual ADX(config-if-1/1)#ipv6 traffic-filter fdry in
Virtual ADX(config)#write memory