Connectivity Issue

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refurbished
Posts: 1
Joined: 2010/05/27 16:32:18
Location: North Carolina
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Connectivity Issue

Postby refurbished » 2010/05/27 16:37:13

I have a fresh install of CentOS release 4.8. All local network connectivity works great over eth1. However, internet connectivity over eth0 is not working at all. I cannot even ping the gateway. In the same rack, with the same exact configuration except for a different IP address, I have another server that is working perfectly, including being able to ping the gateway (an indication that the gateway machine is not eating ICMP packets). I have combed over the config files in the /etc/sysconfig/network-scripts/ directory, and have not been able to find anything out of sorts. I have gone so far as to disable selinux and iptables as well, still with no luck. The network card works as I can shell in from box number two.

Any help with this issue would be greatly appreciated. I have posted the output to route and ifconfig below for reference although I changed the public IP addresses to protect the guilty.

Output from `route -n`:

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Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
65.119.122.96   0.0.0.0         255.255.255.240 U     0      0        0 eth0
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth1
0.0.0.0         65.119.122.97   0.0.0.0         UG    0      0        0 eth0


Output from `ifconfig`:

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eth0      Link encap:Ethernet  HWaddr 00:18:8B:3F:B6:0C 
          inet addr:65.119.122.100  Bcast:65.119.122.111  Mask:255.255.255.240
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:752 errors:0 dropped:0 overruns:0 frame:0
          TX packets:63812 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:78226 (76.3 KiB)  TX bytes:4090051 (3.9 MiB)
          Interrupt:169 Memory:f8000000-f8012100

eth1      Link encap:Ethernet  HWaddr 00:18:8B:3F:B6:0E 
          inet addr:192.168.1.120  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:84866 errors:0 dropped:0 overruns:0 frame:0
          TX packets:576 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7035029 (6.7 MiB)  TX bytes:69112 (67.4 KiB)
          Interrupt:169 Memory:f4000000-f4012100

lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:569 errors:0 dropped:0 overruns:0 frame:0
          TX packets:569 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:52180 (50.9 KiB)  TX bytes:52180 (50.9 KiB)

gerald_clark
Posts: 10642
Joined: 2005/08/05 15:19:54
Location: Northern Illinois, USA

Connectivity Issue

Postby gerald_clark » 2010/05/27 16:44:26

What are we supposed to look for if you change the IP addresses?