nfs problem

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Hi,
I have problem on a home network. there is a server and client pc. Both ping and ssh to each other  are ok.
i set up /etc/exports at server as
/data client(rw,root_squash,sync)

when I try to mount this on client, i got error as
mount: RPC: Program not registered

or

can't contact portmapper: RPC: Remote system error - No route to host


at client
/usr/sbin/rpcinfo -p server
rpcinfo: can't contact portmapper: RPC: Remote system error - No route to host

at server:
 /usr/sbin/rpcinfo -p
   program vers proto   port
    100000    2   tcp    111  portmapper
    100000    2   udp    111  portmapper
    100024    1   udp    858  status
    100024    1   tcp    861  status
    100021    1   udp  32768  nlockmgr
    100021    3   udp  32768  nlockmgr
    100021    4   udp  32768  nlockmgr
    100021    1   tcp  43087  nlockmgr
    100021    3   tcp  43087  nlockmgr
    100021    4   tcp  43087  nlockmgr
    300019    1   tcp    734  amd
    300019    1   udp    735  amd
    100011    1   udp    620  rquotad
    100011    2   udp    620  rquotad
    100011    1   tcp    623  rquotad
    100011    2   tcp    623  rquotad
    100003    2   udp   2049  nfs
    100003    3   udp   2049  nfs
    100003    4   udp   2049  nfs
    100003    2   tcp   2049  nfs
    100003    3   tcp   2049  nfs
    100003    4   tcp   2049  nfs
    100005    1   udp    633  mountd
    100005    1   tcp    636  mountd
    100005    2   udp    633  mountd
    100005    2   tcp    636  mountd
    100005    3   udp    633  mountd
    100005    3   tcp    636  mountd

I looked at nfs howto a

thttp://nfs.sourceforge.net/nfs-howto/ar01s07.html#unable_to_mount_fs

it says:

If you get the error Remote system error - No route to host, but you can ping the server correctly, then you are the victim of an overzealous firewall. Check any firewalls that may be set up, either on the server or on any routers in between the client and the server. Look at the man pages for ipchains, netfilter, and ipfwadm, as well as the IPChains-HOWTO and the Firewall-HOWTO for help.

where to check the firewall settings?

thanks
Yuan

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