redhat cannot mount remote NFS filesystem automatically after booted.please help.

[xiang]

description:both hosts(one redhat 194.128.4.150 255.255.255.0,another suse 194.128.4.140 255.255.255.0)are located in the same subnet.
            i've already modified /etc/fstab,and moute -a is ok, but automatically failed .  why?thanks a lot.           

below is information from /var/log/boot.log

ct 11 16:03:46 FAX1 rc.sysinit: Checking root filesystem succeeded
ct 11 16:03:46 FAX1 rc.sysinit: Remounting root filesystem in read-write mode:  succeeded
ct 11 16:03:47 FAX1 rc.sysinit: Finding module dependencies:  succeeded
ct 11 16:03:47 FAX1 fsck: /boot: clean, 40/130560 files, 35621/522081 blocks
ct 11 16:03:47 FAX1 rc.sysinit: Checking filesystems succeeded
ct 11 16:03:47 FAX1 rc.sysinit: Mounting local filesystems:  succeeded
ct 11 16:03:47 FAX1 rc.sysinit: Enabling local filesystem quotas:  succeeded
ct 11 16:03:48 FAX1 rc.sysinit: Enabling swap space:  succeeded
ct 11 16:03:49 FAX1 microcode_ctl: microcode_ctl startup succeeded
ct 11 16:04:08 FAX1 kudzu:  succeeded
ct 11 16:04:08 FAX1 kudzu: Updating /etc/fstab succeeded
ct 11 16:04:08 FAX1 sysctl: net.ipv4.ip_forward = 0
ct 11 16:04:08 FAX1 sysctl: net.ipv4.conf.default.rp_filter = 1
ct 11 16:04:08 FAX1 sysctl: kernel.sysrq = 0
ct 11 16:04:08 FAX1 sysctl: kernel.core_uses_pid = 1
ct 11 16:04:08 FAX1 network: Setting network parameters:  succeeded
ct 11 16:04:08 FAX1 network: Bringing up loopback interface:  succeeded
ct 11 16:04:10 FAX1 network: Bringing up interface eth0:  succeeded
ct 11 16:04:14 FAX1 mount: pmap_getmaps rpc problem: RPC: Unable to receive; errno = No route to host
ct 11 16:04:23 FAX1 mount: mount: RPC: Remote system error - No route to host
ct 11 16:04:23 FAX1 netfs: Mounting NFS filesystems:  failed
ct 11 16:04:23 FAX1 netfs: Mounting other filesystems:  succeeded
ct 11 16:04:23 FAX1 autofs: automount startup succeeded
ct 11 16:04:24 FAX1 cups: cupsd startup succeeded
ct 11 16:04:24 FAX1 sshd:  succeeded
ct 11 16:04:24 FAX1 xinetd: xinetd startup succeeded
ct 11 16:04:24 FAX1 nfs: Starting NFS services:  succeeded