North American Network Operators Group|
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RE: Advisory - tunneling of IP at exchange points.
Thanks Paul, wonderful job. Side-note (taken from the exploit write-up http://www.linx.net/tunnel-advisory.txt): >// Adding "log-input" to the end of each access-list line will log >// the hardware address of the sender for good measure. IOS 11.1 >// and upwards only (from memory) We find log-input to very unreliable and often producing wrong information. It indeed operates differently across the 11.1 train (no comment on 11.2 offered) I think 11.1.15 breaks it badly. Albeit improperly worded and not well defined in print on CCO, please reference cisco BUGid CSCdj40503 prior to trusting log-input for any valid info. Best regards, David Van Allen - FASTNET(tm) / You Tools Corporation firstname.lastname@example.org (888)321-FAST(3278) http://www.fast.net FASTNET - Business and Personal Internet Solutions > -----Original Message----- > From: Paul Thornton [SMTP:email@example.com] > Sent: Tuesday, November 25, 1997 9:47 AM > To: firstname.lastname@example.org > Cc: email@example.com; firstname.lastname@example.org; email@example.com; > firstname.lastname@example.org; email@example.com > Subject: Advisory - tunneling of IP at exchange points. > > -- PLEASE NOTE: If you are replying to this, consider pruning the list > -- of cc's rather than crossposting replies wildly! > Thanks. > [snip] > The LINX and several of its members have recently had to take action > against an ISP that was using GRE tunneling between exchange points > to appropriate the capacity of other ISPs. > > Keith Mitchell > > Chairman > London InterNet Exchange firstname.lastname@example.org > Geneva House, 3 Park Road > Peterborough PE1 2UX > United Kingdom > Phone: +44 1733 705000 (fax 353929) > > > Paul > > -- > Paul Thornton, Network Engineer, London Internet Exchange Ltd. > Tel: 07000 783797 Mobile: +44 467 372205