North American Network Operators Group

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Re: Maformed SNMP Packet log/trace

  • From: Sean Donelan
  • Date: Tue Feb 26 22:10:33 2002

On Tue, 26 Feb 2002, Richard A Steenbergen wrote:
> A lot of those protocols have people looking at them on a regular basis,
> and they still manage to come up with obscure exploits noone else noticed
> (ex: 23mb of buffer overflows to exploit telnetd).

So what is the solution for a public network operator.  I attended
a presentation last week where a Checkpoint reseller suggested the
client needed to buy eight Checkpoint firewalls to protect a single
web server.  I was impressed, what about the undercoating and scotchguard
fabric protector.

Is it time to fall back in punt?  How would you architect a backbone if
you could do it over?

Enable BGP authentication
Enable NTP authentication (use more than GPS as a source)
Enable OSPF/ISIS authentication

Use TL1 on the Aux port for network management

Ip route null0 packets from outside containing internal-only backbone

Is the complexity  of SSH code worth the protection?  Or is it better
never to access your routers through VTY ports, and always use an
reverse-terminal server to the console from an out-of-band management