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Re: MD5 for TCP/BGP Sessions
On Thu, 31 Mar 2005, Stephen J. Wilcox wrote:
That is why GTSM is useful for hardening, in addition to protecting your borders.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 inThis 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
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