Arch Linux

kbrabrand

Member

Registered: 2014-09-13

Posts: 2

Network problems when running Arch in Virtualbox

Hi,

I've set up Arch in Virtualbox, and after fiddling with the configs yesterday i managed to get it up and running with host-only with static IP and NAT network. I want to do this in order to have the vbox accessible from the host machine at a static IP as well as being visible in the network. Right now both the network interfaces show up when i do a ip addr in the terminal. The ip of the host machine (192.168.56.1) is reachable, but I'm unable to reach for instance 8.8.8.8 (Googles DNS server).

The vbox is set up with two network adapters:

NAT (eth0)
Virtualbox network adapter settings:
Network CIDR: 10.0.2.0/24
Checked options: Supports DHCP

host-only (enp0s8)
Virtualboc network adapter settings:
IPv4 Address: 192.168.56.1
IPv4 Network Mask: 255.255.255.0
DHCP is disabled (since I'll be using static IP anyway).

I'm new to Arch, so I'm not really shure where to start looking. I guess there's something obvious I'm missing..

When running ip addr on the guest machine

[kribrabr@arch ~]$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:1e:7a:09 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe1e:7a09/64 scope link
       valid_lft forever preferred_lft forever
    inet6 fe80::51a6:1d54:4dc8:1d41/64 scope link
       valid_lft forever preferred_lft forever
3: enp0s8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 08:00:27:70:8f:b2 brd ff:ff:ff:ff:ff:ff
    inet 192.168.56.56/24 brd 192.168.56.255 scope global enp0s8
       valid_lft forever preferred_lft forever
    inet6 fe80::a00:27ff:fe70:8fb2/64 scope link
       valid_lft forever preferred_lft forever
    inet6 fe80::7dda:4dec:5b2d:efbe/64 scope link
       valid_lft forever preferred_lft forever

Pinging the host from the guest

[kribrabr@arch ~]$ ping 192.168.56.1
PING 192.168.56.1 (192.168.56.1) 56(84) bytes of data.
64 bytes from 192.168.56.1: icmp_seq=1 ttl=64 time=0.282 ms
^C
--- 192.168.56.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.282/0.282/0.282/0.000 ms

Pinging google DNS from guest

[kribrabr@arch ~]$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
^C
--- 8.8.8.8 ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 3017ms

Running ip route on the guest machine

[kribrabr@arch ~]$ ip route
default via 192.168.56.1 dev enp0s8
default via 10.0.2.2 dev eth0  metric 202
10.0.2.0/24 dev eth0  proto kernel  scope link  src 10.0.2.15  metric 202
192.168.56.0/24 dev enp0s8  proto kernel  scope link  src 192.168.56.56

Any help would be most helpful. I'm all set with x and awesome and eager to start, but now stuck with stupid network problems

kbrabrand

Member

Registered: 2014-09-13

Posts: 2

Re: Network problems when running Arch in Virtualbox

I spotted the error myself - the routes were not right;

default via 192.168.56.1 dev enp0s8
default via 10.0.2.2 dev eth0  metric 202

If I understand it correctly this setup tells Arch to use 192.168.56.1 as a route for reaching the internet. Since that is the host-only network it won't work. It started working again after a run this:

$ ip route del default via 192.168.56.1

But after rebooting Arch, the route was back in there. After digging around in the configuration for the interfaces (mine are located in /etc/netctl/static and /etc/netctl/dhcp) it turned out I had to comment out the gateway line. After doing that, I had the following configs;

/etc/netctl/static:

Description='A basic static ethernet connection'
Interface=enp0s8
Connection=ethernet
IP=static
Address=('192.168.56.56/24')

/etc/netctl/dhcp:

Description='A basic dhcp ethernet connection'
Interface=eth0
Connection=ethernet
IP=dhcp

After rebooting, everything worked. Sweet!

Last edited by kbrabrand (2014-09-13 11:31:52)