[SOLVED] No route to host

keymoo · 09-22-2013, 06:32 AM

I moved my CentOS 6.4 virtual machine from one ESXi host to another and updated /etc/sysconfig/network-scripts/ifcfg-eth0, /etc/sysconfig/network-scripts/ifcfg-eth1 and /etc/udev/rules.d/70-persistent-net.rules to reflect the new MAC addresses.

When I power on the network comes up fine and I can run ifconfig and see the network interfaces as up. However look at these commands:

Code:

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:D4:BD:B0
          inet addr:10.0.0.13  Bcast:10.255.255.255  Mask:255.0.0.0
          inet6 addr: fe80::20c:29ff:fed4:bdb0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:971 errors:0 dropped:0 overruns:0 frame:0
          TX packets:539 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:95302 (93.0 KiB)  TX bytes:63405 (61.9 KiB)

eth1      Link encap:Ethernet  HWaddr 00:0C:29:D4:BD:BA
          inet addr:192.168.0.50  Bcast:192.255.255.255  Mask:255.0.0.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:57 errors:0 dropped:0 overruns:0 frame:0
          TX packets:57 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:5752 (5.6 KiB)  TX bytes:5752 (5.6 KiB)

# nslookup google.com
Server:         10.0.0.6
Address:        10.0.0.6#53

Non-authoritative answer:
Name:   google.com
Address: 173.194.34.137
Name:   google.com
Address: 173.194.34.142
Name:   google.com
Address: 173.194.34.136
Name:   google.com
Address: 173.194.34.128
Name:   google.com
Address: 173.194.34.129
Name:   google.com
Address: 173.194.34.134
Name:   google.com
Address: 173.194.34.131
Name:   google.com
Address: 173.194.34.130
Name:   google.com
Address: 173.194.34.133
Name:   google.com
Address: 173.194.34.135
Name:   google.com
Address: 173.194.34.132


# ping google.com
PING google.com (173.194.34.132) 56(84) bytes of data.
From 192.168.0.50 icmp_seq=2 Destination Host Unreachable
From 192.168.0.50 icmp_seq=3 Destination Host Unreachable
From 192.168.0.50 icmp_seq=4 Destination Host Unreachable
^C
--- google.com ping statistics ---
7 packets transmitted, 0 received, +3 errors, 100% packet loss, time 6406ms
pipe 3


# wget https://s3.amazonaws.com/Minecraft.Download/versions/1.6.4/minecraft_server.1.6.4.jar
--2013-09-22 11:30:24--  https://s3.amazonaws.com/Minecraft.Download/versions/1.6.4/minecraft_server.1.6.4.jar
Resolving s3.amazonaws.com... 176.32.101.82
Connecting to s3.amazonaws.com|176.32.101.82|:443... failed: No route to host.

Any ideas what I need to do to fix?

cospengle · 09-22-2013, 07:57 AM

Looks like you may have an incorrect default gateway address.

What is the output of the route command?

keymoo · 09-22-2013, 08:42 AM

Ah ha!, I think you might be right, how do I change that? The default gateway should be 10.0.0.6

Code:

# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
link-local      *               255.255.0.0     U     1002   0        0 eth0
link-local      *               255.255.0.0     U     1003   0        0 eth1
192.0.0.0       *               255.0.0.0       U     0      0        0 eth1
10.0.0.0        *               255.0.0.0       U     0      0        0 eth0
default         192.168.0.1     0.0.0.0         UG    0      0        0 eth1

# cat /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=aluminium.localdomain
GATEWAY=10.0.0.6

keymoo · 09-22-2013, 08:51 AM

Fixed it with

Code:

ip route replace default via 10.0.0.6 dev eth0