nanog mailing list archives
Re: The tale of a single MAC
From: Ian Henderson <ianh () ianh net au>
Date: Sun, 2 Jan 2011 17:00:49 +1100
On 02/01/2011, at 2:33 PM, Graham Wooden wrote:
I encountered an interesting issue today and I found it so bizarre – so I thought I would share it.
Had a fun one with D-Link ADSL modems a few years ago. The MAC address used to source PPPoE frames from the ADSL interface was the same in a batch of modems. This wasn't a problem when using our wholesaler's ATM based DSLAMs, but when we moved users to our own Ethernet based systems, we ran into some fun. The DSLAMs were configured to rewrite the user MAC address into a constructed address including their DSLAM port and PVC details toward the BRAS. Even though this rewrite was occurring correctly, within a single DSLAM unit two users with the same real MAC address would have five minutes of connectivity each, alternating between the two ports. Rgds, - I.
Current thread:
- Re: The tale of a single MAC, (continued)
- Re: The tale of a single MAC bmanning (Jan 01)
- Re: The tale of a single MAC Steven Bellovin (Jan 02)
- Re: The tale of a single MAC Mark Smith (Jan 02)
- Re: The tale of a single MAC Steven Bellovin (Jan 02)
- Re: The tale of a single MAC Kevin Oberman (Jan 03)
- Re: The tale of a single MAC Jethro R Binks (Jan 06)
- Re: The tale of a single MAC Graham Wooden (Jan 01)
- Re: The tale of a single MAC Graham Wooden (Jan 01)
- Re: The tale of a single MAC Graham Wooden (Jan 02)
- Re: The tale of a single MAC Corey Quinn (Jan 02)
- Re: The tale of a single MAC Marshall Eubanks (Jan 02)
- Re: The tale of a single MAC Lynda (Jan 02)
- Re: The tale of a single MAC Dobbins, Roland (Jan 02)