cannot connect to local network although everything is configured properly

stevena · 11-29-2009, 12:39 AM

running RedHat Enterprise Linux 4.
here's my /etc/sysconfig/network-scripts/ifcfg-eth0

Code:

DEVICE=eth0
BOOTPROTO=none
HWADDR=00:1f:c6:ca:a3:ef
IPADDR=10.16.10.96
NETMASK=255.255.255.0
ONBOOT=yes
GATEWAY=10.16.10.254
TYPE=Ethernet
USERCTL=yes
IPV6INIT=no
PEERDNS=yes
IPADDR=10.16.10.96

my routing table

Code:

[root@cvs_server ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.16.10.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         10.16.10.254    0.0.0.0         UG    0      0        0 eth0

my etc/hosts

Code:

[root@cvs_server ~]# more /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1       localhost       localhost
10.16.10.96     cvs_server

i made sure that iptables are off too.
when i start the network connection i can see from the log that there were no errors during the startup but i cannot access the other machines on the local network nor does this machine accept incoming connections too because it cannot be seen from all the other machines. the weirdest thing is that sometimes if i restart the machine IT WORKS( sometimes after a couple of restarts ) !!! i haven't been able to find out why, i didn't change anything in the configuration nothing at all.

btmiller · 11-29-2009, 03:51 PM

Check the output of "ifconfig eth0" (no quotes) to make sure that the IP address is actually being assigned and that packets are being transmitted/received. If you get something like "eth0: device not found" it means you don't have the rioght friver. Is it possible that you have two network interfaces plugged into the computer and you simply have the cable plugged into the wrong one?

nimnull22 · 11-29-2009, 04:00 PM

do please:
ifconfig eth0 down
ifconfig eth0 up
ping 10.16.10.96
ping 10.16.10.254

Post outputs here, please.

stevena · 11-30-2009, 04:15 AM

Quote:

Originally Posted by nimnull22

do please:
ifconfig eth0 down
ifconfig eth0 up
ping 10.16.10.96
ping 10.16.10.254

Post outputs here, please.

after i first posted i restarted a couple of times and now it's working but i did what you're asking for before( ifdown and ifup eth0 ), the IP was assigned to eth0.

this is what i was having when pinging the gateway and eth0

Code:

[root@cvs_server ~]# ping 10.16.10.96
PING 10.16.10.96 (10.16.10.96) 56(84) bytes of data.
64 bytes from 10.16.10.96: icmp_seq=0 ttl=64 time=0.026 ms
64 bytes from 10.16.10.96: icmp_seq=1 ttl=64 time=0.023 ms

--- 10.16.10.96 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.023/0.024/0.026/0.005 ms, pipe 2


[root@cvs_server ~]# ping 10.16.10.254
PING 10.16.10.254 (10.16.10.254) 56(84) bytes of data.
From 10.16.10.254 icmp_seq=1 Destination Host Unreachable

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