07-15-2021 04:11 AM
Hi,
I've a ISR 4331 running 15.5(3)S4b. Once in a while we loose the uplink connection. The dialer stays up but IP doesn't work anymore. Does anyone have a clue? I did search the bug database but found nothing.
Regards,
Peter.
07-15-2021 05:26 AM
Hello @Peter Spekreijse (keps) ,
please post the configuration to see how you have configured DDR Dial on Demand Routing.
For new IOS releses the use of dialer watch and a watch-list is the recommended workaround.
With dialer watch the router checks the routing table to see if routes to be watched disappears.
In the classic DDR setup you use a floating static default route to trigger routing over the dialer interface.
ip route 0.0.0.0 0.0.0.0 Dialer1 220
this acts as a backup default route to be used.
do the dialer interface get an IP address ?
show interface dialer x
when it is up provides you an IP address ?
if using PPP looks for state OPEN for IPCP
Hope to help
Giuseppe
07-15-2021 05:41 AM
Hi,
The relevant portion of the config follows:
interface Dialer1
mtu 1492
ip address negotiated
no ip redirects
no ip unreachables
no ip proxy-arp
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username <removed> password <removed>
no cdp enable
ip virtual-reassembly
ip route 172.31.255.139 255.255.255.255 Dialer1
dialer-list 1 protocol ip permit
172.31.255.139 is the BGP neighbor we get a default route from.
Now and then the IP connectivity over the dialer stops. We can't ping our BGP neighbor. A shut / no shut on the dialer solves the problem.
I think it's a bug. But how do I find it in the database?
Regards,
07-15-2021 08:51 AM
Hello @Peter Spekreijse (keps) ,
I don't understand your network scenario.
1) The dialer interface is used as a backup path or it is your primary path because you have a PPPoE connection to the internet?
2) the BGP peer has a fixed IP address, normally BGP allows sessions with static IP address, is your dialer interface getting always the same IP addres from the provider ?
3) >> Now and then the IP connectivity over the dialer stops. We can't ping our BGP neighbor. A shut / no shut on the dialer solves the problem.
I agree this looks like a SW issue unless the session is timed out by the ISP when you shut/unshut a new PPP session is started.
Contact the ISP and ask about their policies for this kind of service.
Hope to help
Giuseppe
07-19-2021 04:44 AM
Hi Giuseppe,
1. Its the primary connection. Its a private network. We've a 4G backup link.
2. We're always getting the same IP address from the provider (private space).
3. I already contacted the ISP. No answers there.
Thanks for the reply.
Regards,
Peter.
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