I added "no ip proxy-arp" under BVI1 and rebooted the router to clear all the entries in the arp table and right away as soon as the circuit came up and i logged in I'm still seeing the same random MAC's and alot of them even though its only up a few minutes.
To keep email from getting too long I've posted debug info here: http://pastebin.com/AxMB3mw8 On Fri, Dec 12, 2014 at 11:29 AM, Karsten Thomann <[email protected] > wrote: > > Hi Chris > > Is there any configured default route on the router? > Is it possible to post output of sh ip route? > This looks like a default route without next hop ip and proxy arp at the > provider... > > Kind regards > Karsten > > Gesendet von meinem BlackBerry > Originalnachricht > Von: chris > Gesendet: Freitag, 12. Dezember 2014 17:21 > An: cisco-nsp@pu ck.nether.net > Betreff: [c-nsp] Weird ADSL bridging issue > > Hello, > > We have a small site we inherited that is still on ADSL on legacy sprint in > the northeast. > The ILEC is using aal5snap and we have a WIC-1ADSL with a physical ATM > interface thats bridged to BVI1, and we get a dynamic WAN ip from the ILEC > via DHCP on BVI1. > > the ADSL part of our config looks like this: > > *bridge irb* > *!* > > *interface ATM0/0* > * description DSL Layer2* > * no ip address* > * atm restart timer 300* > * no atm ilmi-keepalive* > * dsl operating-mode auto * > * clock rate aal5 7000000* > * clock rate aal2 7000000* > * bridge-group 1* > * bridge-group 1 spanning-disabled* > * hold-queue 224 in* > * pvc 8/35 * > * encapsulation aal5snap* > * !* > *!* > > *interface BVI1* > * ip address dhcp* > * ip nat outside* > > I was looking internet into a report of weird internet issues and I found > the arp table for BVI1 is full (several pages) of lots of random internet > IP's with the same MAC address which isnt local to the router: > > *Protocol Address Age (min) Hardware Addr Type Interface* > *Internet 17.110.228.155 26 0030.881b.f475 ARPA BVI1* > *Internet 8.8.8.8 162 0030.881b.f475 ARPA BVI1* > *Internet 23.3.13.24 25 0030.881b.f475 ARPA BVI1* > *Internet 17.110.228.154 84 0030.881b.f475 ARPA BVI1* > *Internet 74.209.254.102 24 0030.881b.f475 ARPA BVI1* > *Internet 74.125.228.215 29 0030.881b.f475 ARPA BVI1* > *Internet 173.194.121.18 29 0030.881b.f475 ARPA BVI1* > *Internet 17.110.228.159 84 0030.881b.f475 ARPA BVI1* > *Internet 69.172.216.55 24 0030.881b.f475 ARPA BVI1* > *Internet 4.2.2.2 162 0030.881b.f475 ARPA BVI1* > *Internet 31.13.69.80 25 0030.881b.f475 ARPA BVI1* > *Internet 173.194.121.17 26 0030.881b.f475 ARPA BVI1* > *Internet 17.110.224.152 36 0030.881b.f475 ARPA BVI1* > *Internet 66.196.81.223 2 0030.881b.f475 ARPA BVI1* > *Internet 74.125.228.219 21 0030.881b.f475 ARPA BVI1* > *Internet 17.167.146.44 22 0030.881b.f475 ARPA BVI1* > *Internet 173.194.121.30 26 0030.881b.f475 ARPA BVI1* > *Internet 17.172.239.90 35 0030.881b.f475 ARPA BVI1* > *Internet 74.122.189.133 97 0030.881b.f475 ARPA BVI1* > *Internet 173.252.79.23 49 0030.881b.f475 ARPA BVI1* > *Internet 17.173.255.74 144 0030.881b.f475 ARPA BVI1* > > Interestingly enough when I look up the OUI of that MAC I see Sierra > Systems aka Redback which I happen to know is the DSLAM that the ILEC is > using. > > Anyone seen anything like this? I am trying to figure out if its an issue > with the bridging on the local router or telco misconfiguration. > > I rarely touch any ATM anymore so I'm scratching my head here but hoping > something obvious might stand out to someone. > > TIA, > chris > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
