Date: Wed, 16 Apr 2003 13:37:42 -0500 From: Larry Rosenman <ler@lerctr.org> To: Jamie Bowden <ragnar@sysabend.org> Cc: John Polstra <jdp@polstra.com> Subject: Re: "broadcast ping" message Message-ID: <315530000.1050518262@lerlaptop.iadfw.net> In-Reply-To: <20030416113247.P46401-100000@moo.sysabend.org> References: <20030416113247.P46401-100000@moo.sysabend.org>
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--On Wednesday, April 16, 2003 11:33:31 -0700 Jamie Bowden <ragnar@sysabend.org> wrote: > On Wed, 16 Apr 2003, Larry Rosenman wrote: > >> --On Wednesday, April 16, 2003 10:58:20 -0700 John Polstra >> <jdp@polstra.com> wrote: >> >> > In article <20030416105033.H46401-100000@moo.sysabend.org>, >> > Jamie Bowden <ragnar@sysabend.org> wrote: >> >> On Wed, 16 Apr 2003, John Polstra wrote: >> >> >> >> > To make a FreeBSD system respond to broadcast pings, you have to set >> >> > the sysctl variable net.inet.icmp.bmcastecho to 1. >> >> >> >> Shouldn't the default be to DTRT and respond unless disabled? Until >> >> now, the only systems on my network that didn't respond to broadcast >> >> pings were my windows boxes, but I consider them broken by default. >> >> Why has the default behavior changed, and isn't this a POLA issue? >> > >> > It was changed for security reasons. Responding to broadcast pings >> > creates several potential denial of service attacks. >> It's also against current best practices for ISP's. Even Cisco changed >> the routers >> to NOT respond to directed-broadcast by default. >> >> The RFC was NOT written for today's internet. > > Then submit a draft for a superceding RFC, don't ignore it just because > it's inconvenient. That's a Microsoft attitude. Take it up with the NSP folks. I've not written standards stuff, and this is now a Best Current Practices. I've had my share of DDoS's from broadcast pings. It's NOT JUST ME, it's the ENTIRE ISP Community. LER > > Jamie Bowden > > -- > "It was half way to Rivendell when the drugs began to take hold" > Hunter S Tolkien "Fear and Loathing in Barad Dur" > Iain Bowen <alaric@alaric.org.uk> > -- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 972-414-9812 E-Mail: ler@lerctr.org US Mail: 1905 Steamboat Springs Drive, Garland, TX 75044-6749
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