nanog mailing list archives
Re: Smurfing
From: "David J. Schmidt" <davids () on-ramp ior com>
Date: Sun, 15 Feb 1998 21:45:29 -0800 (PST)
On Fri, 13 Feb 1998, Randy Bush wrote:
o All router administrators on the immediately reachable Internet needs to turn off directed broadcasts on their router interfaces. It's conceivable that "a significant portion of all" would do as well, but the magnitude of this problem boggles the mind. First of all, we'd need to distribute the appropriate amount of clue to all the corners of the net where this needs to happen. Maybe, just maybe, we'll get there sometime (I'm an optimist!).why should this not have become the default mode for all vendor diustributed router code? randy
While I would argue that directed broadcasts should be off by default, I recently read RFC 1812 (Requirements for IP Version 4 routers) and found the following in section 4.2.2.11: (d) { <Network-prefix>, -1 } Directed Broadcast - a broadcast directed to the specified network prefix. It MUST NOT be used as a source address. A router MAY originate Network Directed Broadcast packets. A router MUST receive Network Directed Broadcast packets; however a router MAY have a configuration option to prevent reception of these packets. Such an option MUST default to allowing reception. Until the RFC gets modified router vendors will probably allow reception of directed broadcasts by default to remain compliant with RFC 1812. David.Schmidt () ior com Internet Ventures, Inc. (509)622-2878 x238 Spokane, Washington http://www.perki.net/ (509)622-2872 (fax)
Current thread:
- Re: Smurfing, (continued)
- Re: Smurfing Paul Ferguson (Feb 17)
- Re: Smurfing Bradley Reynolds (Feb 17)
- Re: Smurfing Tatsuya Kawasaki (Feb 17)
- Re: Smurfing Alex P. Rudnev (Feb 18)
- Re: Smurfing Paul Ferguson (Feb 18)
- Re: Smurfing Dean Anderson (Feb 13)
- Re: Smurfing ken emery (Feb 13)
- Re: Smurfing Dean Anderson (Feb 16)
- Message not available
- Re: Smurfing Jay R. Ashworth (Feb 13)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing David J. Schmidt (Feb 15)
- Re: Smurfing Steve Camas (Feb 15)
- Re: Smurfing Jon Lewis (Feb 15)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing Craig A. Huegen (Feb 13)
- Re: Smurfing Michael Shields (Feb 15)
- Re: Smurfing Dean Anderson (Feb 16)