If you setup a sub-Interface (e.g. Fastethernet 0/0.900 with an ip address of 10.100.8.1 /30) and connect it via ethernet to another router with an interface (Fastethernet 0/0 ip address 10.100.8.2 /30) would you expect to be able to ping it? That is from a directly connected interface ping the subinterface on the other router? I can not ping directly connected interfaces in GNS3 when they have subinterface configurations. If I remove the sub-interface configuration and put it on the main interface (e.g. Fasterthernet 0/0 above) it works just fine? Am I on crack?
Yea, I am on crack! This cant work, if you have subinterfaces, you had to encapsulate with dot1q and this means you need a device that understands vlan tags! So you cant just connect the two router interfaces with your ethernet cable. Sorry to waste everyones time, but there is no delete button!
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