nanog mailing list archives
Re: impossible circuit
From: Jay Hennigan <jay () west net>
Date: Sat, 16 Aug 2008 23:57:06 -0700
Is this only happening in one direction? One possibility is that the carrier has a different circuit that is provisioned up, HDLC, with no physical connection. A short-circuit in a DACS or MUX is bridging the transmit interface towards your destination with a transmit interface on the unused but active circuit. This would cause your traffic in that direction to fork both on the desired path and some rogue path that eventually gets routed to your destination.
The ethernet equivalent would be a SPAN monitor port plumbed to a transmit-only interface on a different network.
Definitely a strange one. If I'm correct, when the other circuit starts to get customer traffic things will probably break completely for either the new customer seeing your PPP traffic or for both of you.
-- Jay Hennigan - CCIE #7880 - Network Engineering - jay () impulse net Impulse Internet Service - http://www.impulse.net/ Your local telephone and internet company - 805 884-6323 - WB6RDV
Current thread:
- impossible circuit Jon Lewis (Aug 10)
- Re: impossible circuit George Carey (Aug 10)
- Re: impossible circuit Laurence F. Sheldon, Jr. (Aug 11)
- Re: impossible circuit Justin Shore (Aug 11)
- Re: impossible circuit Jay R. Ashworth (Aug 11)
- Re: impossible circuit Laurence F. Sheldon, Jr. (Aug 11)
- Re: impossible circuit George Carey (Aug 10)
- Re: impossible circuit list-nanog (Aug 12)
- Re: impossible circuit Jon Lewis (Aug 12)
- Re: impossible circuit Jon Lewis (Aug 16)
- Re: impossible circuit list-nanog (Aug 16)
- Re: impossible circuit Jay Hennigan (Aug 16)
- Re: impossible circuit Paul Wall (Aug 18)
- Re: impossible circuit Jon Lewis (Aug 12)
- Re: impossible circuit Jon Lewis (Aug 13)
- Re: impossible circuit Andy Johnson (Aug 13)
- Re: impossible circuit Jared Mauch (Aug 13)
- <Possible follow-ups>
- Re: Impossible Circuit Matt Rice (Aug 10)