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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Denial of service attacks apparently from UUNET Netblocks
Let me try again, since it seems I wasn't clear enough. There's been a lot of delightful talk about whether/how to retrieve the calling phone on a given port. But none about how to determine with confidence which port the nasty packets come from. Without source address assurance, any user on any port of any dialin box can source packets with any IP address(es) desired. So you don't know which port to go get ANI/CLID for. What is also not explained is how to produce multi-megabit streams from dialup. MP? Multiple independent calls? Ping to broadcast with faked source address? Or was the attack not from dialup at all? In other words, I don't know why this attack generated a debate about ANI/CLID. Barney Wolff > Date: Wed, 8 Oct 1997 10:33:16 -0500 (CDT) > From: Joe Shaw <[email protected]> > To: Barney Wolff <[email protected]> > Cc: [email protected] > Subject: Re: Denial of service attacks apparently from UUNET Netblocks > Content-Length: 1151 > > On Tue, 7 Oct 1997, Barney Wolff wrote: > > > Date: Tue, 7 Oct 1997 12:04:27 -0400 (EDT) > > > From: Alex Przekupowski <[email protected]> > > > > > > On the MAX's that I have set up, I log that info to syslog (Local 7), and > > > can pull it up at will. If you need a hand, just let me know. By > > > combining the syslog output, and the RADIUS accounting logs, we can > > > definately prove at least the home address of the attacker. > > > > How are you providing source address assurance, on either a MAX or a TNT? > > My understanding, which may well be flawed, is that the only way is with > > a filter. I have heard claims, which may also be flawed, that filters > > have a severe performance impact on MAX and TNT. > > > > Without source address assurance, how do you know that the packets are > > actually coming from the user who was assigned that address at that time? > > > > Barney Wolff <[email protected]> > > What he means is that he can provide the number of the person who dialed > into his equipment. That information can be given to you on your PRI, and > reported in both radius accounting and syslog. > > Joe Shaw - [email protected] > NetAdmin - Insync Internet Services > >
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