{SPAM?} Re: IPv6 Deployment for the LAN

Bernhard Schmidt berni at birkenwald.de
Fri Nov 6 19:09:04 CST 2009

David W. Hankins <David_Hankins at isc.org> wrote:

> There are some wireless equipment that claim to have a setting that
> forces all packets through the wireless bridge (where all traffic is
> between clients and bridge, and never client to client), and so one
> can filter DHCPv6 and maybe RA, but I am kind of skeptical about how
> much of this is elective and dependent upon client implementation...

As already said, wireless in infrastructure mode (with access points)
always sends traffic between clients through the access point, so a
decent AP can filter this.

On the university network we frequently had the problem of rogue RAs (in
99% of the cases generated by Windows hosts running 6to4 and ICS). We
are currently migrating from an unencrypted wireless with mandatory VPN
towards full IPv4/IPv6 eduroam (WPA2 Enterprise) with about 500
concurrent hosts, spread around four large subnets. Fortunately our
access point vendor (Colubris, which very sadly is HP Procurve now)
supports pcap-style filters on the wireless side. We've deployed the
ingress filter

ether proto 0x888e or (ip6 and not (ip6[6] == 58 and ip6[40] == 134)) or
(ip and not (udp port 137 or udp port 138 or udp port 139 or udp src
port 67)) or arp

six months ago and have never had any problems again.


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