Problems with bonding and dhcp

[mattymcfatty]

Hey, I need some help. I have been googling for three days, and I though posting to a forum would be more helpful than throwing my box out the window.

Here's what I want to do:
gonesouthcomputing.com/images/temp/networkproblems.jpg

__________________________________eth1---isp1
private network---eth0 <--nat--> bond0 <
~~~~~~~~~~~~~~~~~~~~~~~~~~~eth2---isp2

I was able to bond eth1 and eth2 together as bond0, but I am having problems with setting up two gateways on bond0. I can set one (eg ISP1) and all the traffic always routes through that ISP. Thus defeating the purpose of bonding.

eth1 and eth2 pull an ip just fine and were able to ping the internet before bonding.

Originally, I set the bond0 ip to the same subnet at my internal network, but I read that in order to set up nat you need to have the adapters on two seperate subnets.

Every time I fix one issue with this scenario something else breaks. I have tried dozens of different configurations. I am relatively sure that it is just a routing table issue, but I was wondering if anyone could point me in the right direction.

here is my ifconfig:

bond0     Link encap:Ethernet  HWaddr 00:14:D1:1D:00:00
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::214:d1ff:fe1d:650b/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:15459 errors:0 dropped:0 overruns:0 frame:0
          TX packets:23 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1235724 (1.1 MiB)  TX bytes:1596 (1.5 KiB)

eth0      Link encap:Ethernet  HWaddr 00:25:64:AC:00:00
          inet addr:10.10.17.252  Bcast:10.10.17.255  Mask:255.255.255.0
          inet6 addr: fe80::225:64ff:feac:39c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:722 errors:0 dropped:0 overruns:0 frame:0
          TX packets:605 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:77279 (75.4 KiB)  TX bytes:122473 (119.6 KiB)
          Interrupt:169 Memory:dfbf0000-dfc00000

eth1      Link encap:Ethernet  HWaddr 00:14:D1:1D:00:00
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:15429 errors:0 dropped:0 overruns:0 frame:0
          TX packets:12 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1233924 (1.1 MiB)  TX bytes:896 (896.0 b)
          Interrupt:169 Base address:0xe00

eth2      Link encap:Ethernet  HWaddr 00:14:D1:1D:00:00
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:30 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1800 (1.7 KiB)  TX bytes:700 (700.0 b)
          Interrupt:217 Base address:0x2f00

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:1708 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1708 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:396134 (386.8 KiB)  TX bytes:396134 (386.8 KiB)

here is netstat -nr (I have changed this many times to add gateways to bond0, but can only seem to add one gateway route for one isp)

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 bond0
10.10.17.0      0.0.0.0         255.255.255.0   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         10.10.17.254    0.0.0.0         UG        0 0          0 eth0

here is my dhcpd.conf file

# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
ddns-update-style interim;
subnet 10.10.17.0 netmask 255.255.255.0 {
        option routers                  10.10.17.252;
        option subnet-mask              255.255.255.0;
        option time-offset              -17000;
        range                           10.10.17.0 10.10.17.255;
        }

here is ifcfg-eth0

# Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe
DEVICE=eth0
BOOTPROTO=dhcp
DHCPCLASS=
HWADDR=00:25:64:AC:03:EF
ONBOOT=yes
DHCP_HOSTNAME=myhostname.local

here is ifcfg-eth1

# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth1
BOOTPROTO=none
ONBOOT=yes
USERCTL=no
MASTER=bond0
SLAVE=yes

here is ifcfg-eth2

# Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
DEVICE=eth2
BOOTPROTO=none
ONBOOT=yes
USERCTL=no
MASTER=bond0
SLAVE=yes

here is ifcfg-bond0

DEVICE=bond0
IPADDR=192.168.1.1
NETMASK=
NETWORK=
BROADCAST=
GATEWAY=
ONBOOT=yes
BOOTPROTO=none
USERCTL=no

I appreciate any help you can offer. Thanks!

[Irithori]

Thus defeating the purpose of bonding.

There seems to be a misunderstanding.

Bonding will help you to failover a NIC, in case one breaks.
Bonding may also increase the available bandwidth.

But you cannot use it to upstream to two different ISPs.
See a bonded NIC as just one.

You might want to look into the advanced routing howto as a starting point.
Linux Advanced Routing & Traffic Control HOWTO

[mattymcfatty]

But you cannot use it to upstream to two different ISPs.
See a bonded NIC as just one.

Well, that would explain why I was having so much trouble getting this accomplished

Thank you for your quick reply. I will post back when I find a solution using your link.