Home page logo

nanog logo nanog mailing list archives

Re: do bogon filters still help?
From: Kevin Loch <kloch () hotnic net>
Date: Thu, 12 Jan 2006 10:58:15 -0500

Florian Weimer wrote:
* Pim van Pelt:
Hi, here's a member of 'the folks at bit.nl'.  Just a quick note to
say that we have been sourcing IPv4 packets from at a rate
of 2.000 to 10.000 packets per second since early 2003, so I'm guessing we have sent some 750.000 billion packets by now.

And this is just so wrong.  You should use an address you own as a
source address.  Otherwise, packets tend to get dropped by filters.

Wouldn't you expect to see packets return from the same address
you send them to?  ICMP and stateful firewalls work much better
that way.   Our 6to4 relay also soucres packets from,
it seems to work best that way.

Don't filter in any direction unless you want to
break 6to4.  If you want to limit your exposure you could
allow only proto 41 and icmp packets and not break it.

If you have native IPv6 on your network you could run
a local 6to4 relay for your customers and filter
to/from your peers.

- Kevin

  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]