[c-nsp] Ping TO Gateway is High Latency, Ping THROUGH Gateway is Normal Latency

[Felix Nkansah]

Hi,

I am noticing what I think is a strange behavior.

I have a Cisco ISR Internet gateway that is also performing
router-on-a-stick for the Internal network.

>From a PC in one VLAN when I ping another resource in other VLANs, the ping
latency is normal (<2ms).

When I ping resources on the Internet, the ping latency is also normal
(<170ms).

However, when I ping the router interface IP itself (default gateway), the
latency is extremely high (>450ms).

Even though traffic THROUGH the router has a normal response time, I am
wondering why traffic TO the router results in high latency.

Meantime if I ping internal resources from the router itself, I get <1ms
response time.

I would appreciate an explanation from other members.

Thanks. Felix