A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Best Current Practice for Filtering ICMPv6 Messages in Firewalls
Author(s) : E. Davies, J. Mohacsi
Filename : draft-davies-v6ops-icmpv6-filtering-bcp-00.txt
Pages : 20
Date : 2005-7-12
In networks supporting IPv6 the Internet Control Message Protocol
version 6 (ICMPv6) plays a fundamental role with a large number of
functions, and a correspondingly large number of message types and
options. A number of security risks are associated with uncontrolled
forwarding of ICMPv6 messages, and it is desirable to configure site
firewalls to intercept inappropriate usages of ICMPv6 which might
allow an attacker outside a site to probe or compromise the site
network. On the other hand, compared with IPv4 and the corresponding
protocol ICMP, ICMPv6 is essential to the functioning of IPv6 rather
than a useful auxiliary. Hence too aggressive filtering of ICMPv6
messages can be detrimental to the establishment of IPv6
communications. This means that effective filtering of ICMPv6
requires a more complex configuration than was needed for ICMP. This
document provides some recommendations for ICMPv6 firewall filter
configuration that will allow propagation of ICMPv6 messages that are
needed to maintain the functioning of the network but drop messages
which are potential security risks.
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