Question

2

Ubuntu as a Router/Gateway - Unable to access WAN

rated 0 times [ 2] [ 0] / answers: 1 / hits: 4710 / 1 Year ago, wed, january 25, 2023, 5:32:18

I am currently trying to set up a home router using a machine running Ubuntu 12.04. The machine has two ethernet ports. eth0 is LAN and eth1 is WAN.

I have set eth0 to a static ip and have eth1 request an ip via DHCP.

/etc/network/interface

auto lo

iface lo inet loopback



auto eth0

iface eth0 inet static

  address 10.1.1.10

  netmask 255.255.255.0

  gateway 10.1.1.10

  dns-nameservers 10.1.1.1 10.1.1.10



auto eth1

iface eth1 inet dhcp

This allows me to ping LAN computers, but I am unable to ping or access any external hosts. The modem is giving eth1 a valid ip address. The machine is setting it's LAN ip to 10.1.1.10 (to be moved to 10.1.1.1 when everything is working).

I have added the following to /etc/bind/named.conf.options:

    forwarders {

            8.8.8.8;

            8.8.4.4;

    };

net.ipv4.ip_forward=1 has been added to /etc/sysctl.conf.

$ route

Kernel IP routing table

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

default         Vanir.local     0.0.0.0         UG    100    0        0 eth0

10.1.1.0        *               255.255.255.0   U     0      0        0 eth0

98.162.168.0    *               255.255.252.0   U     0      0        0 eth1

link-local      *               255.255.0.0     U     1000   0        0 eth0

Does anybody see what I'm missing in order to allow both WAN and LAN traffic on my machine?

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donurp

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answered 1 Year ago ticeate · Accepted Answer

I was able to resolve this issue by editing /etc/udev/rules.d/70-persistent-net.rules. By making eth0 my WAN NIC, linux automatically used it's gateway as the default gateway.

/etc/udev/rules.d/70-persittent-net.rules:

# This file was automatically generated by the /lib/udev/write_net_rules

# program, run by the persistent-net-generator.rules rules file.

#

# You can modify it, as long as you keep each rule on a single

# line, and change only the value of the NAME= key.



# PCI device 0x10ec:/sys/devices/pci0000:00/0000:00:1c.4/0000:03:00.0 (r8169)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="FF:FF:FF:FF:FF:F0", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"



# PCI device 0x10ec:/sys/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/0000:05:01.0 (r8169)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="FF:FF:FF:FF:FF:F1", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"



# PCI device 0x10ec:0x8169 (r8169)

SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="FF:FF:FF:FF:FF:F2", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth2"