I am setting up a cisco 891 router and 2960 switch. I am using router on a stick and have 2 vlans set up that are separate from our production network.
192.168.100.240 /24 (current production) fe8 interface
192.168.99.1 /24 gi0.1 vlan 99
172.24.25.1 /24 gi0.2 vlan 25
from either of the vlans, I can reach the internet and everything on the production network just fine, except for our mail server that is at 192.168.100.1, by ping or through the browser interface.
I can ping it from the router console login, but if I specify the source address as one of the sub-interface IP's, I get no reply. I can ping any of the other ip addresses with a source specified) on the .100 network, just not the 100.1. I cannot ping it from the switch console login with or without a source.
I can post more info from the running config if needed.