ppp installing unwanted route

[Ernie Luzar]

Mike Tancsa wrote:
> This seems like a bit of deja vu, but I cant seem to recall if the
> problem went away in the past or I worked around it.
> 
> I am trying to manage failover via an ethernet connection, and a PPPoE
> connection as a backup route. Dynamic routing happens via quagga / BGP.
> The problem is, ppp seems to inject a default route, even when its not
> configured to.  My ppp stanza looks like
> 
> 
> pppoe:
>  add 192.168.153.2 HISADDR	
>  set device PPPoE:igb2
>  set server /var/run/vdsl-internet "" 0177
>  set speed sync
>  enable echo
>  disable vjcomp
>  set cd 15
>  set dial
>  set login
>  set timeout 0
>  set lqrperiod 10
>  set authname spare2 at domain
>  set authkey the password
>  set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 255.255.255.0
> 
> 
> there are no ppp.link[up|down] files.
> 
> If I start the box without ppp running, the routing table according to
> quagga looks as expected
> 
> 
>> sh ip route
> Codes: K - kernel route, C - connected, S - static, R - RIP,
>        O - OSPF, I - IS-IS, B - BGP, P - PIM, A - Babel,
>        > - selected route, * - FIB route
> 
> B>* 0.0.0.0/0 [20/0] via 10.255.255.1, igb0, 00:00:46
> 
> the default route is picked up from its configured peer via bgp via the
> ethernet connection learned over bgp.
> 
> 
>> sh ip bgp
> BGP table version is 0, local router ID is 192.168.254.12
> Status codes: s suppressed, d damped, h history, * valid, > best, =
> multipath,
>               i internal, r RIB-failure, S Stale, R Removed
> Origin codes: i - IGP, e - EGP, ? - incomplete
> 
>    Network          Next Hop            Metric LocPrf Weight Path
> *> 0.0.0.0          10.255.255.1                         102 65060 i
> *> 172.30.84.0/24   0.0.0.0                  0          32768 i
> 
> Displayed  2 out of 2 total prefixes
> 
> 
> The shell confirms as well
> 
> # netstat -nr | grep def
> default            10.255.255.1       UG1          85   1500       igb0
> #
> 
> Then I start up ppp
> 
> # ppp -ddial pppoe
> Working in ddial mode
> Using interface: tun0
> 
> and the default route is gone
> 
> but quagga sees some kernel route across tun0, but its not really there.
> 
>> sh ip route
> Codes: K - kernel route, C - connected, S - static, R - RIP,
>        O - OSPF, I - IS-IS, B - BGP, P - PIM, A - Babel,
>        > - selected route, * - FIB route
> 
> K>* 0.0.0.0/0 via 67.43.128.14, tun0
> B   0.0.0.0/0 [20/0] via 10.255.255.1, igb0, 00:04:49
> 
> if I kill off ppp, the default route gets re-added, and I see that old
> kernel route as an inactive stale entry
> 
>> sh ip route
> Codes: K - kernel route, C - connected, S - static, R - RIP,
>        O - OSPF, I - IS-IS, B - BGP, P - PIM, A - Babel,
>        > - selected route, * - FIB route
> 
> K   0.0.0.0/0 via 67.43.128.14 inactive
> B>* 0.0.0.0/0 [20/0] via 10.255.255.1, igb0, 00:07:02
> 
> 
> Any ideas whats going on ?
> 
> 	---Mike
> 
> 
> 


Try adding these two lines
  disable iface-alias
  iface clear