11-21-2014 07:14 AM - edited 03-05-2019 12:12 AM
Hi Everyone.
I am working at a site that has a Cisco router that is setup to connect the LAN to the internet. The client runs a VoIP service hosted by the provider. We have noticed packets are dropping. Calls connect but there isn't two-way flow, you can't hear the party at the other end. I wanted to drop this at the feet of the VoIP provider but then I did a sh ip cache flow on the router and this is what I noticed.
SrcIf SrcIPaddress DstIf DstIPaddress Pr SrcP DstP Pkts
Gi0/1 172.30.0.136 Null xx.xxx.32.89 01 0000 0800 922
All the time traffic to the provider's server, xx.xxx.32.89 is always sent to the Null interface instead of the G0/0.
I don't know if this has a bearing on the problem, but when I connected a Linksys router, we did not have this problem.
Any help would be appreciated.
11-23-2014 08:29 AM
Hello
Are you using quality of service on the cisoc router or on the lan switch?
do you know what your ISP making for voice should be?
Has any changes been made to your network and if so has this problem occurred since that change !
res
Paul
11-23-2014 11:02 PM
Hi.
I'm not doing QoS on the router or LAN Switch and I don't know what the ISP marking for voice should be. And no also, there haven't been any changes to the network.
Thanks
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