Router Dropping Traffic

[Christopher Kofon]

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.

[paul driver]

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

[Christopher Kofon]

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