[SOLVED] Bonded ethernet interface can ping internally but not externally

asuderma · 10-14-2009, 06:27 PM

Hi all,

So I keep reading that bonding ethernet devices is supposed to be easy. I have followed several tutorials and tried a few things on my own, and I can't seem to get it right.

I currently have a setup that allows me to ping internally on my network, but when I try to ping externally I get the error:

connect: Network is unreachable

Before I bonded the interface my connection worked fine.

Here are my config files. I am running centos 5.3 on a virtual machine.

/etc/sysconfig/network-scripts/ifcfg-bond0

Code:

DEVICE=bond0
BOOTPROTO=none
ONBOOT=yes
NETWORK=192.168.1.0
NETMASK=255.255.255.0
IPADDR=192.168.1.211
USERCTL=no

/etc/sysconfig/network-scripts/ifcfg-eth1

Code:

# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
HWADDR=00:0c:29:88:59:47
MASTER=bond0
SLAVE=yes
USERCTL=no

/etc/sysconfig/network-scripts/ifcfg-eth0

Code:

# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
HWADDR=00:0c:29:88:59:3d
ONBOOT=yes

/etc/modprobe.conf

Code:

alias eth0 pcnet32
alias scsi_hostadapter mptbase
alias scsi_hostadapter1 mptspi
alias scsi_hostadapter2 ata_piix
alias eth1 pcnet32

alias bond0 bonding
options bond0 mode=0 miimon=100

output of cat /proc/

Code:

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:88:59:3d

Slave Interface: eth1
MII Status: up
Link Failure Count: 0
Permanent HW addr: 00:0c:29:88:59:47

I would appreciate any advice you can give me to fix this.
Thanks

never say never · 10-14-2009, 08:09 PM

Just to be clear you can ping 192.168.1.xxx but you can't ping google.com??

If this is true sounds like your default route is not set correctly.

Can you provide the output of:

ifconfig

and

route

asuderma · 10-14-2009, 08:19 PM

Quote:

Originally Posted by never say never

Just to be clear you can ping 192.168.1.xxx but you can't ping google.com??

Yes, that is the case.

ifconfig:

Code:

bond0     Link encap:Ethernet  HWaddr 00:0C:29:88:59:3D
          inet addr:192.168.1.211  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe88:593d/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:4478 errors:0 dropped:0 overruns:0 frame:0
          TX packets:182 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:282670 (276.0 KiB)  TX bytes:18558 (18.1 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:29:88:59:3D
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:2249 errors:0 dropped:0 overruns:0 frame:0
          TX packets:191 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:142098 (138.7 KiB)  TX bytes:19960 (19.4 KiB)
          Interrupt:177 Base address:0x1400

eth1      Link encap:Ethernet  HWaddr 00:0C:29:88:59:3D
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:2244 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:141472 (138.1 KiB)  TX bytes:0 (0.0 b)
          Interrupt:185 Base address:0x1480

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:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

route:

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 bond0
169.254.0.0     *               255.255.0.0     U     0      0        0 bond0

never say never · 10-14-2009, 08:55 PM

OK you don't have a default route in your routing table.

try:

Code:

route add default gw xxx.xxx.xxx.xxx bond0

Where xxx.xxx.xxx.xxx is your Gateway (router or modem IP) probably 192.168.1.1.

Then run route

you should get output similar to this:

Code:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 bond0
169.254.0.0     *               255.255.0.0     U     0      0        0 bond0
default         xxx.xxx.xxx.xxx     0.0.0.0     UG    0      0        0 bond0

This should get you working but you will still need to set the config so it will work across reboots.

I am not familiar with CentOS but it should be a file in
/etc/sysconfig/network or a sub direcotry

mine is here:
/etc/sysconfig/network/routes

Anyway you need to make sure your default route is set up, or you will have to run the above route command with every reboot.

Hope this helps.

asuderma · 10-14-2009, 09:51 PM

That worked fantastically. I just forgot to put the GATEWAY=xxx.xxx.xxx.xxx into the ifcfg-bond0 file. I must be tired.

Thanks a bunch!