if y is your gateway, there is the possibility that it's handling doing that via iptables. if this is the case then you might need to manually re-establish the packet forwarding between that machine and the local network.
it's been a while for me but it's something like:
echo 1 > /proc/sys/net/ipv4/ip_forward
which of course is typed as root in a console on Y
regards, brett
if forwarding is not enabled as per above, you might also want to check that iptables has rules that allow packets to be forwarded and not dropped, as well as nat being turned on. Something like "iptables -L" will do it (you will probably need more options other than the -L I just can't remember them off the top of my head).
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