I 'm experiencing a very strange situation regarding arp.
My topology :
<--router vlan Y C3750 router vlan X--> C2960G --> C3020--> Client 1
Client 1 is connect to a C3020 switch in vlan X and is trying to reach his default gateway using icmp
Client 1 sent arp request ( who is on vlan X interface ( hsrp)) but never receive answer . So it cannot join his default gateway.
When I connect a client 2 on C2960G in the same vlan X, then client 1 is now able to ping his default gateway because it"s now receiving the arp response from the default gateway. If I remove the Client 2 from the C2960, the client 1 lose the connection to the gateway.
At this time, the arp request is never arriving to the 3750 excepted when the client 2 is back on C2960G
Can some help me to solve the issue. This append for new vlan X not for other vlans already in use.
Also, client 1 can ping all other computer in the vlan excepted his default gateway.
vlan x is well forwarded up to the C3020.
vlan x is defined everywhere
Thanks a lot.