2 nics probles no ping!!!!!

xrtc · 01-24-2006, 06:40 AM

hello slackguys :P

i have 2 nics on my slak 10.2 and its running only samba server
eth0: 192.168.1.1
eth1: 192.168.1.2

i have both nics with cables and they gone to my switch,eth0 is 1GB

i can ping 192.168.1.1 and 192.168.1.2.if i unplug the cable from eth0 i cant ping both ip... that means that the packets requests for eth1 pass throughout eth0!!!!!!

can anyone help me plz!!!

PS : i compiled my shelf kernel 2.6.15.1 maybe its something wrong in my kernel???

piete · 01-24-2006, 08:56 AM

I suggest checking the output of /sbin/route . My first guess is that things are not being configured properly and there are no routes through eth1!

- Piete.

xrtc · 01-25-2006, 09:00 AM

Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.1.0 0.0.0.0 255.255.255.192 U 0 0 0 eth0
192.168.1.0 0.0.0.0 255.255.255.192 U 0 0 0 eth1
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 192.168.1.254 0.0.0.0 UG 0 0 0 eth0

this is my route -n

piete · 01-25-2006, 09:13 AM

I'm afraid I have just the one NIC, but, I have the following:

Code:

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     0.0.0.0         255.255.255.0   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         192.168.0.1     0.0.0.0         UG    1      0        0 eth0

You should try adding a gateway route to eth1. Just rummaging from the command line you should be able to add it by:

Code:

route add default gw 192.168.1.254 eth1

Have a read of the man pages and try `route add` for more information on how to make it work. I don't know why the startup scripts don't bring up a second route, but I suspect there was never any intention of using two cables to go to the same place =)

- Piete.

xrtc · 01-25-2006, 10:10 AM

i tried to make it diferent subnet .... 192.168.1.1 eth0
and 192.168.0.1 eth1 but nothing works...

piete · 01-25-2006, 01:22 PM

I'd bet my left leg that if you take down

Code:

0.0.0.0         192.168.1.254     0.0.0.0         UG    1      0        0 eth0

and put up

Code:

0.0.0.0         192.168.1.254     0.0.0.0         UG    1      0        0 eth1

You'd be routing everything through eth1, but, not having 2 nics I can't help you any further. I think you will have to do some more reading on using 2 nics and respecifying what exactly it is you want to do with them. You may need an extra program if you want to do traffic shaping.

Try getting a clearer idea of what you want to accomplish by putting both NICs in the same place and head over to the network forum, or perhaps a kind network guru will help you out from here =)

Sorry I can't help more.
- Piete.

allend · 01-25-2006, 06:14 PM

I have Samba servers running multiple NICs.
I suggest that you have one subnet per NIC.
In your /etc/rc.d/rc.inet1.conf

# Config information for eth0:
IPADDR[0]="192.168.1.1"
NETMASK[0]="255.255.255.192"
...
# Config information for eth1:
IPADDR[1]="192.168.2.1"
NETMASK[1]="255.255.255.192"

# You will probably also want to set a default gateway
# so that you can have internet access.

# Default gateway IP address:
GATEWAY="192.168.1.1"