nanog mailing list archives
Re: Denial of service attacks apparently from UUNET Netblocks
From: "Jay R. Ashworth" <jra () scfn thpl lib fl us>
Date: Tue, 7 Oct 1997 16:01:34 -0400
On Tue, Oct 07, 1997 at 11:43:24AM -0700, ken emery wrote:
One question, "can't the sender (aka the person initiating the call) forge the ANI information?" I know on a cisco (1003 series) it will croak if this is incorrect, but what about an Ascend or other ISDN device? Unless things have changed I don't think the TELCO's in the USA guarantee the ANI is correct.
In short: no. It's exceptionally difficult to forge ANI, with one small exception. _Some_ originating end-offices apparently don't validate ANI information handed to them by PBXs... otherwise, spoofing ANI requires intercepting the loop to the receiving sub, or subverting the switch. This was discussed at length in one of the telecom newsgroups, about 4 months ago, search for "ANI spoof" or "CNID spoof". Cheers, -- jra -- Jay R. Ashworth jra () baylink com Member of the Technical Staff Unsolicited Commercial Emailers Sued The Suncoast Freenet "People propose, science studies, technology Tampa Bay, Florida conforms." -- Dr. Don Norman +1 813 790 7592
Current thread:
- Re: Denial of service attacks apparently from UUNET Netblocks, (continued)
- Re: Denial of service attacks apparently from UUNET Netblocks Charles Sprickman (Oct 06)
- Re: Denial of service attacks apparently from UUNET Netblocks James_deleskie (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Greg A. Woods (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Dale Drew (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Eric Wieling (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Adrian Bool (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Alex Przekupowski (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks John A. Tamplin (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Mike Diehn (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks ken emery (Oct 07)
- Message not available
- Re: Denial of service attacks apparently from UUNET Netblocks Jay R. Ashworth (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Eric Wieling (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Kevin Smith (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks John A. Tamplin (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Kevin Smith (Oct 07)
- Message not available
- Re: Denial of service attacks apparently from UUNET Netblocks Jay R. Ashworth (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Kevin Smith (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Alex Przekupowski (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Eric Wieling (Oct 07)
- Re: Denial of service attacks apparently from UUNET Netblocks Joe Shaw (Oct 08)
- Message not available
- Re: Denial of service attacks apparently from UUNET Netblocks Jay R. Ashworth (Oct 07)