ifconfig -a

Question

1

I couldn't get 2 NICs working together

rated 0 times [ 1] [ 0] / answers: 1 / hits: 563 / 2 Years ago, sat, march 12, 2022, 4:05:37

I've got an Ubuntu 10.04 server with this configuration:

eth0: 192.168.10.XXX mask 255.255.255.0 gw 192.168.10.254

eth1: 192.168.0.XXX mask 255.255.255.0 gw 192.168.0.3

eth0 is used for incoming and outgoing trafic (internal webserver)

eth1 i want to use for accessing the network: 192.168.51.0/24 by gateway 192.168.0.1

when eth1 is down, the webserver is reachable.

When i want to bring the state of eth1 to up, i use the following commands:

$ sudo su

# ifconfig eth1 up

# route add -net 192.168.51.0 netmask 255.255.255.0 gw 192.168.0.1

# ping 192.168.51.XXX

[i've got contact]



# ip route add default via 192.168.10.254

# ping 192.168.51.XXX

[i've got contact]

but when i want to access the webserver, i can't get contact.

Can someone please give me some advice so the network .51 AND the webserver (network .10) is reachable?

ifconfig

# ifconfig

eth0      Link encap:Ethernet  HWaddr mymac  

          inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fee0:39c/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:23207 errors:0 dropped:0 overruns:0 frame:0

          TX packets:24924 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:2683656 (2.6 MB)  TX bytes:12841148 (12.8 MB)



eth0:1    Link encap:Ethernet  HWaddr mymac  

          inet addr:192.168.10.10  Bcast:192.168.10.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



eth1      Link encap:Ethernet  HWaddr mymac  

          inet addr:192.168.0.237  Bcast:192.168.0.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fee0:3a6/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:3742 errors:0 dropped:0 overruns:0 frame:0

          TX packets:143 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:318099 (318.0 KB)  TX bytes:12994 (12.9 KB)



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:3175 errors:0 dropped:0 overruns:0 frame:0

          TX packets:3175 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:221390 (221.3 KB)  TX bytes:221390 (221.3 KB)

route -n

# route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.51.0    192.168.0.1     255.255.255.0   UG    0      0        0 eth1

192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1

192.168.10.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    0      0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    100    0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    100    0        0 eth0

/etc/network/interfaces

# cat /etc/network/interfaces 



# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

auto eth0

iface eth0 inet static 

address 192.168.10.2

netmask 255.255.255.0

gateway 192.168.10.254



# A second ip address for SSL

auto eth0:1

iface eth0:1 inet static

address 192.168.10.10

netmask 255.255.255.0

gateway 192.168.10.254



auto eth1

iface eth1 inet static

address 192.168.0.237

netmask 255.255.255.0

gateway 192.168.0.3

post-up route add -net 192.168.51.0 netmask 255.255.255.0 gw 192.168.0.1

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

aveerakfas

Add To Favorites

Follow

Total Points: 106

Total Questions: 148

Total Answers: 129

Location: Monaco

Member since Sun, Jan 1, 2023

1 Year ago

answered 2 Years ago issfullus · Accepted Answer

I've got the solution!

The command i had executed was:

# route del -net 192.168.0.0 netmask 255.255.255.0 eth1

After that command my: 0 network, 10 network AND 51 network was accessible.

I also edit /etc/sysctl.conf and uncomment net.ipv4.ip_forward=1 before, but i'm not sure if this is necessary.

my configs:

ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:0c:29:e0:03:9c  

          inet addr:192.168.10.2  Bcast:192.168.10.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fee0:39c/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:53794 errors:0 dropped:0 overruns:0 frame:0

          TX packets:53916 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:6812117 (6.8 MB)  TX bytes:21573511 (21.5 MB)



eth0:1    Link encap:Ethernet  HWaddr 00:0c:29:e0:03:9c  

          inet addr:192.168.10.10  Bcast:192.168.10.255  Mask:255.255.255.0

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1



eth1      Link encap:Ethernet  HWaddr 00:0c:29:e0:03:a6  

          inet addr:192.168.0.237  Bcast:192.168.0.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fee0:3a6/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:29845 errors:0 dropped:0 overruns:0 frame:0

          TX packets:469 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 

          RX bytes:2555869 (2.5 MB)  TX bytes:42872 (42.8 KB)



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:8157 errors:0 dropped:0 overruns:0 frame:0

          TX packets:8157 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 

          RX bytes:624350 (624.3 KB)  TX bytes:624350 (624.3 KB)

route -n

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

192.168.51.0    192.168.0.1     255.255.255.0   UG    0      0        0 eth1

192.168.10.0    0.0.0.0         255.255.255.0   U     0      0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    0      0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    100    0        0 eth0

0.0.0.0         192.168.10.254  0.0.0.0         UG    100    0        0 eth0

/etc/network/interfaces

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).



# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

auto eth0

iface eth0 inet static 

address 192.168.10.2

netmask 255.255.255.0

gateway 192.168.10.254



auto eth0:1

iface eth0:1 inet static

address 192.168.10.10

netmask 255.255.255.0

gateway 192.168.10.254



auto eth1

iface eth1 inet static

address 192.168.0.237

netmask 255.255.255.0

gateway 192.168.0.1

post-up route add -net 192.168.51.0 netmask 255.255.255.0 gw 192.168.0.1