This is driving me crazy now, I have a 2900XL switch with a VLAN1 address of 172.16.0.11.

I also have a 2610XM router connected to Fa0/16 which is running a DHCP server on 172.16.0.254. When I connect the PC client to Fa0/1 it obtains an address of 172.16.0.1 from the DHCP server (all good so far).

The problem is I can ping the switch from the PC but not the other way around. I have disabled all firewalls and security settings on the PC (Windows XP) but it just isn't working.

I've also tried connecting a second PC to another switch port and tried from there, the same happens. I can ping the switch but not the PC, likewise the two PC's cannot see each other - they are both on the same VLAN.

I am sure that I'm missing something obvious but would appreciate some guidance on this?

Have you tried setting an "ip default-gateway" on the switch, pointed at the router's interface? I know it should only matter for when the switch attempts to send data out side of it's own subnet... But it might help.

Perhaps if you post your switch config we can be of more help.

HTH

-Ian

Could you please post the configuration of the switch,

I believe the problem is most probably in the switch.