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I am having a problem mounting a filesystem from one server to another. Seems like an easy thing to solve, however it's very strange. I have two RedHat servers, one is RH7.1(ServerA:192.168.1.150) and one is RH7.3(ServerB:192.168.1.170,192.168.1.171). ServerA is acting as an NFS client trying to mount a filesystem from ServerB. Both servers have multiple NIC cards. ServerB has two NIC cards on the same subnet. ServerA has access to the internet and has ipchains. I have added a rule to ipchains on ServerA to allow all traffic over its eth2, which is the 192.168.1.x network. ServerB does not run ipchains or iptables.
Now the strange part is this. From ServerA I can run
[root@ServerA init.d]# rpcinfo -p ServerB
program vers proto port
100000 2 tcp 111 portmapper
100000 2 udp 111 portmapper
100011 1 udp 933 rquotad
100011 2 udp 933 rquotad
100011 1 tcp 936 rquotad
100011 2 tcp 936 rquotad
100005 1 udp 32791 mountd
100005 1 tcp 32786 mountd
100005 2 udp 32791 mountd
100005 2 tcp 32786 mountd
100005 3 udp 32791 mountd
100005 3 tcp 32786 mountd
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100021 1 udp 32792 nlockmgr
100021 3 udp 32792 nlockmgr
100021 4 udp 32792 nlockmgr
However I can not run
[root@ServerA init.d]# showmount -e ServerB
mount clntudp_create: RPC: Port mapper failure - RPC: Timed out
Very strange... From ServerB to ServerA everything functions fine.
Another strange this is that when I try to do a mount from ServerA I get the following
[root@ServerA init.d]# mount ServerB:/var/ExportDir /mnt/ServerB
mount: RPC: Timed out
However in /var/log/message on SeverB I get the following:
Jun 20 14:23:13 ServerB rpc.mountd: authenticated mount request from ServerA:645 for /var/ExportDir (/var/ExportDir)
the that's it. Nothing else.
Another thing that I've tried is to run tcpdump on ServerA and ServerB to see what is getting sent when doing a mount command.