North American Network Operators Group
Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: MD5 for TCP/BGP Sessions

  • From: Pekka Savola
  • Date: Thu Mar 31 12:44:50 2005 
On Thu, 31 Mar 2005, Stephen J. Wilcox wrote:

On Thu, 31 Mar 2005, Stephen J. Wilcox wrote:

without wishing to repeat what can be googled for.. putting acls on your edge to
protect your ebgp sessions wont work for obvious reasons -- to spoof data and
disrupt a session you have to spoof the srcip which of course the acl will allow
in

This is why this helps for eBGP sessions only the peer is also protecting its
borders. I.e., if you know the peer's network has spoofing-prevention enabled,
nobody is able to spoof the srcip the peer uses.

trusting a third party to protect your network is imho not best practice, in
addition many networks may have considerable customers inside them making
attacking from inside trivial
That is why GTSM is useful for hardening, in addition to protecting your borders.

When I say 'border protection', I also mean the border between an operator and its customers. I.e., strict uRPF -like prevention, so that nobody (neither a peer, upstream or customer) is able to spoof the infrastructure IP addresses.

That's what we're doing, and I'd hope more people would as well.

--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings