nanog mailing list archives
Re: Broadcast pings.
From: "Jay R. Ashworth" <jra () scfn thpl lib fl us>
Date: Tue, 23 Dec 1997 21:14:29 -0500
On Tue, Dec 23, 1997 at 05:32:15PM -0600, Phil Howard wrote:
When a packet arrives, take note of the interface and gateway it came from. Check the route tables for where a reply to this packet could be delivered. Don't choose only the best route, but compare where the packet came from with all valid reply routes (except broad defaults larger than a certain size that can be configured). If the packet came from where it is valid to reply, then allow the packet to proceed. If not, then discard it (an ICMP probably won't make it back to the right place anyway).
Oh ghod... weren't you around, Phil, when _I_ got roundly trounced and reviled as a clueless newbie about 3 months ago for alomst exactly the same solution? The outcome as I recall, was that the only practical thing to do was ingress filtering at boundary routers, if they would. Cheers, -- jra -- Jay R. Ashworth jra () baylink com Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "Two words: Darth Doogie." -- Jason Colby, Tampa Bay, Florida on alt.fan.heinlein +1 813 790 7592
Current thread:
- Broadcast pings. Jamie Scheinblum (Dec 22)
- Re: [nanog] Broadcast pings. Stephen Balbach (Dec 22)
- Re: Broadcast pings. Joe Shaw (Dec 23)
- Re: Broadcast pings. Stephen Balbach (Dec 23)
- Re: Broadcast pings. Phil Howard (Dec 23)
- Re: Broadcast pings. Paul Ferguson (Dec 23)
- Re: Broadcast pings. Dean Anderson (Dec 23)
- Message not available
- Re: Broadcast pings. Jay R. Ashworth (Dec 24)
- <Possible follow-ups>
- Re: Broadcast pings. Al Roethlisberger (Dec 22)
- RE: Broadcast pings. Al Roethlisberger (Dec 22)
- RE: Broadcast pings. Jamie Scheinblum (Dec 22)