Hi Guys,

I have a problem with new installed machine.
i have installed RHEL5 2.6.18-92.el5xen kernel and configured 2 network cards.

DEVICE=eth0
BOOTPROTO=static
#HWADDR=xx:xx:xx:xx:xx:xx
ONBOOT=yes
NETWORK=192.168.6.0
NETMASK=255.255.255.0
IPADDR=192.168.6.51
TYPE=Ethernet

DEVICE=eth1
BOOTPROTO=static
#HWADDR=xx:xx:xx:xx:xx:xx
ONBOOT=yes
NETWORK=192.168.9.0
NETMASK=255.255.255.0
IPADDR=192.168.9.19
TYPE=Ethernet

and this is my route:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.6.0 * 255.255.255.0 U 0 0 0 eth0
192.168.9.0 * 255.255.255.0 U 0 0 0 eth1
192.168.122.0 * 255.255.255.0 U 0 0 0 virbr0
169.254.0.0 * 255.255.0.0 U 0 0 0 eth1
default 192.168.6.1 0.0.0.0 UG 0 0 0 eth0

/etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=test-p05
GATEWAY=192.168.6.1


when i ping to the network .9 (as for the eth1) i receive:

[root@test-P05 network-scripts]# ping 192.168.9.100
PING 192.168.9.100 (192.168.9.100) 56(84) bytes of data.
From 192.168.9.19 icmp_seq=2 Destination Host Unreachable
From 192.168.9.19 icmp_seq=3 Destination Host Unreachable
From 192.168.9.19 icmp_seq=4 Destination Host Unreachable


and ping to network .6 (as for the eth0) is working:

root@test-P05 network-scripts]# ping 192.168.6.50
PING 192.168.6.50 (192.168.6.50) 56(84) bytes of data.
64 bytes from 192.168.6.50: icmp_seq=1 ttl=64 time=1.29 ms
64 bytes from 192.168.6.50: icmp_seq=2 ttl=64 time=0.129 ms
64 bytes from 192.168.6.50: icmp_seq=3 ttl=64 time=0.134 ms



moreover, my ip6tables, iptables are disabled.
selinux = disabled
firewall down.

please help.

thanks,
ofer.

set net.ipv4.ip_forward = 1 if not already done.

then run

You will need to turn on iptables to route between the different networks with rules similar but not necessarily the same as these

Hi Centosboy,

Thanks for the quick reply.
ive tried your advice but its still can't ping to .9 network.
ive also tried to restart the network and ive noticed that its setting the ip_forward to 0 again:

[root@test-P05 ~]# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296

[root@test-P05 ~]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down interface eth1: [ OK ]
Shutting down loopback interface: [ OK ]
Disabling IPv4 packet forwarding: net.ipv4.ip_forward = 0
[ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: [ OK ]
Bringing up interface eth1: [ OK ]
[root@test-P05 ~]#

any idea?

hi

try this setting

first please remove GATEWAY setting from /etc/sysconfig/network

then in each eth0 and eth1 file add gateway entry for their subnets.
then turn on ipforwarding permanently (net.ipv4.ip_forward = 1)
then do route add.