I'm running Solarwinds Real-Time Interface Monitor, in which I am monitoring one of my remote routers, which is a 2691 VPN bundled device. I'm troubleshooting high latency issues which is hurting my site to site Microsoft exchange connector. Supposedly, high latency will prevent the RPC binding process from initiating successfully and therefore the reason why my mail queues are building up during business hours.
Anyway, I'm looking at the stats and there is an interface that I am not familiar with, which is the Null0 interaface.
Bytes received are high at 862kbps and the bytes transmitted is 0 bps.
This is a T1 connected site.
serial1/0 374kbps in and 174kbps out
tunnel111 in 49.1 kbps and 135kbps out
fastethernet0/1 in 240kbps in and 464 kbps out
I'm hoping that someone can shed some light on this before I go ahead and open a TAC case.
Null0 is a default interface on the router to which all the packets are dropped to if there is no alternate destination available to be routed to. Turn on IP cache flow on the interfaces and determine which source and destination is created this flow to be dropped on the Null0 interface.
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