nanog mailing list archives
Re: Router modifications to deal with smurf
From: John Hawkinson <jhawk () bbnplanet com>
Date: Sun, 26 Apr 1998 17:59:42 -0400 (EDT)
We requests that your routers be configurable, at the interface level, to prevent the forwarding of an ICMP echo-request packet through an interface that has a broadcast or wire address that matches the destination address of that packet.
Modifications that cause the forwarding path to behave differently for some type of packets are *bad*. ICMP echo-requests should be treated identically to other sorts of packets. If you s/an ICMP echo-request/an IP/, then you have the same as "no ip directed-broadcast". Your wording is sufficiently vague such that I can't tell if that's what you meant or not. I don't know if you're trying to avoid being cisco-specific, or if you're being vague for some other reason.
We also request that the default configurations of your routers be modified to prevent said forwarding.
I don't have a problem with this.
We request that your routers be configurable, both globally and and the interface level, with the interface configuration overiding the global configuration, to prevent the forwarding of an IP packet with a source network address different from the network address of the interface on which it was received. We also request that the default configurations of your routers be modified to prevent, globally, said forwarding.
I'd be concerned that having this as a default is not necessarily the right thing in sufficiently large numbers of situations as to make this a bad idea. --jhawk
Current thread:
- Router modifications to deal with smurf Rusty Zickefoose (Apr 26)
- Re: Router modifications to deal with smurf John Hawkinson (Apr 26)
- Message not available
- Re: Router modifications to deal with smurf Jay R. Ashworth (Apr 27)
- Message not available
- Re: Router modifications to deal with smurf John Hawkinson (Apr 26)
- Re: Router modifications to deal with smurf Craig A. Huegen (Apr 26)
- Message not available
- Re: Router modifications to deal with smurf Kelly J. Cooper (Apr 27)
- Re: Router modifications to deal with smurf John A. Tamplin (Apr 27)
- Re: Router modifications to deal with smurf Michael Dillon (Apr 27)
- Message not available
- Re: Router modifications to deal with smurf Tony Li (Apr 29)