10-29-2008 02:07 AM - edited 03-06-2019 02:11 AM
Hi all,
I have a strange problem, at least for me :), i have a Cisco 1801 ((C180X-BROADBAND-M), Version 12.4(15)T5) with two wan interfaces, an ADSL and a ethernet.
interface FastEthernet0
description Enlace ETH
ip address dhcp client-id FastEthernet0
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
!
interface ATM0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
pvc 8/32
encapsulation aal5snap
pppoe-client dial-pool-number 1
!
!
interface Dialer1
description ADSL IP DINAMICA
ip address negotiated
ip mtu 1492
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username xxx password xxx
!
My default gateway is via static route throught wan ethernet.
ip route 0.0.0.0 0.0.0.0 FastEthernet0 x.x.x.x track 100
and the backup is ADSL,
ip route 0.0.0.0 0.0.0.0 Dialer1 200
I have an object track to manage the backup
track 100 rtr 1 reachability
delay down 15
ip sla 1
! ip de google
icmp-echo 66.102.9.99 source-interface FastEthernet0
timeout 3000
threshold 5
frequency 3
ip sla schedule 1 life forever start-time now
Other routes,
ip route 66.x.x.99 255.255.255.255 FastEthernet0 x.x.x.x
ip route 66.x.x.99 255.255.255.255 Null0 200
ip route 1.1.1.1 255.255.255.255 Dialer1
ip route 2.2.2.2 255.255.255.255 Dialer1
ip route 3.3.3.3 255.255.255.255 Dialer1
Now, my problem.
A couple of minutes later of set default gateway, this route disappear and router set its default gateway to Dialer1 (ADSL).
The debug of ip routing i attached because characters limitations
the change of route is at *Oct 29 08:24:57.437
Some ideas?
Thanks in advance
10-29-2008 05:00 AM
David
The debug that you posted is only debug of ip routing and it does not give a full picture of what is going on. My guess is that at 08:24:57.437 your track reported that 66.102.9.99 was no longer reachable via the next hop through FastEthernet0 which results in withdrawal of the default route through that interface. Can you get a debug output that combines ip routing and of the track activity?
HTH
Rick
10-29-2008 05:38 AM
Hi Rick, thank you for your answer.
I forgot before speak about track.
The track debug is on and 66.102.9.99 is avaiable always.
The active debugs are,
sh debugging
Track debugging is on
IP routing:
IP routing debugging is on
IP-STATIC:
IP static routing destination debugging is on, for 0.0.0.0 0.0.0.0
IP static routing detail debugging is on
IP static routing time spent debugging is on
IP static routing summary debugging is on
and show track command show that reachability is up
Track 100
Response Time Reporter 1 reachability
Reachability is Up
9 changes, last change 00:22:53
Delay down 15 secs
Latest operation return code: Over threshold
Latest RTT (millisecs) 71
Tracked by:
STATIC-IP-ROUTING 0
10-29-2008 05:52 AM
Hi David,
What's the present status. Which route is being installed as the IP SLA is reporting the tracking correctly and object is up.
Please paste the " show logs " from the router.
-amit singh
10-29-2008 06:04 AM
In this moment.
#sh track
Track 100
Response Time Reporter 1 reachability
Reachability is Up
9 changes, last change 00:42:58
Delay down 15 secs
Latest operation return code: Over threshold
Latest RTT (millisecs) 72
Tracked by:
STATIC-IP-ROUTING 0
S* 0.0.0.0/0 is directly connected, Dialer1
#sh ip ro 0.0.0.0
Routing entry for 0.0.0.0/0, supernet
Known via "static", distance 200, metric 0 (connected), candidate default path
Routing Descriptor Blocks:
* directly connected, via Dialer1
Route metric is 0, traffic share count is 1
#sh run | i ip route
ip route 0.0.0.0 0.0.0.0 FastEthernet0 x.x.x.x track 100
ip route 0.0.0.0 0.0.0.0 Dialer1 200
other output ommited.
11-03-2008 07:06 PM
Hello..
Why do you have two interfaces ,Fe0 & dial0 as ' ip nat outside '. Just curious!!
11-04-2008 12:12 AM
Hello,
Because that two are wan interfaces and i need to overload in both.
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