"No route to Host" on the same network?

gplus · 06-21-2006, 10:10 AM

I have 2 servers setup on the same network, but I don't know why I can't connect to each other, no matter I try to ftp, ssh, email... etc. I always got "No rote to host" and the connection was closed.

I have already turn off both server's firwall and try, but the problem still exist.
I think I need some help...

Server 1 route -n
-------------------------------------
Kernel IP routing table @ 219.77.1.10
Destination Gateway Genmask Flags Metric Ref Use
Iface
219.77.1.0 0.0.0.0 255.255.255.128 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 219.77.1.1 0.0.0.0 UG 0 0 0 eth0

Server 2 route -n (with 2 ips)
-------------------------------------
Kernel IP routing table @ 219.77.1.11 and 219.77.1.12
Destination Gateway Genmask Flags Metric Ref Use
Iface
219.77.1.11 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
219.77.1.12 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
219.77.1.0 0.0.0.0 255.255.255.128 U 0 0 0 eth0
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
0.0.0.0 219.77.1.1 0.0.0.0 UG 0 0 0 eth0

intel_ro · 06-21-2006, 10:31 AM

are u shure your interace are up because no route to host is about interfaces .. if u use virtual interface check the config files /etc/stsconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
IPADDR=x.x.x.x
NETMASK=255.255.255.128
NETWORK=x.x.x.0
BROADCAST=x.x.x.127
ONBOOT=yes
MII_NOT_SUPPORTED=yes

/etc/stsconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
BOOTPROTO=static
IPADDR=x.x.x.x
NETMASK=255.255.255.128
NETWORK=x.x.x.0
BROADCAST=x.x.x.127
ONBOOT=yes
MII_NOT_SUPPORTED=yes

add don't use staic route command for setting virtual inteface ip ! and check the cables if u have link !

gplus · 06-21-2006, 10:49 AM

I have also check the "network-scripts" directory and I am sure I got the right setting on both ifcfg-eth0 and ifcfg-0:0. Moreover, I can access to externel network (let say ftp to mirror.centos.org) without any problem.

intel_ro · 06-21-2006, 12:33 PM

did u set netmask at ifcfg-eth0:0 and eth0 because see the netmask u use is 255.255.255.255 and one more thing activate ip_forward to forward traffic from interface eth0 to eth0:0

intel_ro · 06-21-2006, 01:00 PM

if u set it like this will work
files /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=static
IPADDR=219.77.1.11
NETMASK=255.255.255.128
NETWORK=219.77.1.0
BROADCAST=219.77.1.127
ONBOOT=yes
MII_NOT_SUPPORTED=yes

/etc/stsconfig/network-scripts/ifcfg-eth0:0
DEVICE=eth0:0
BOOTPROTO=static
IPADDR=219.77.1.12
NETMASK=255.255.255.128
NETWORK=219.77.1.0
BROADCAST=219.77.1.127
ONBOOT=yes
MII_NOT_SUPPORTED=yes