Kind of Point-to-Point connection

Bob.Sauvage · 08-04-2014, 06:58 AM

Hello *,

I need to create a point-to-point connection to my gateway. From my provider, the server can only reach its gateway (and its locally configured) IP addresses directly. All other packets need to be routed via the default gateway. Consequently, a /32 network needs to be set up (for reasons of network security).

Wiki-article: http://wiki.hetzner.de/index.php/Net...int_connection

Hereunder my file /etc/sysconfig/network-scripts/ifcfg-eth0 (as describer in the Wiki)

Code:

DEVICE=eth0
HWADDR=00:1E:45:ZZ:34:F9
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.1
NETMASK=255.255.255.255

Hereunder my /etc/sysconfig/network-scripts/route-eth0 file (as describer in the Wiki)

Code:

ADDRESS0=0.0.0.0
NETMASK0=0.0.0.0
GATEWAY0=192.168.1.254

I restart the network: service network restart

An error appears: "RTNETLINK answers: No such Process".

The output of command "route":

Code:

link-local * 255.255.0.0 U 1002 0 0 eth0

After some search, I edit the file /etc/sysconfig/network as below:

Code:

NETWORKING=YES
HOSTNAME=server.domain.lan
GATEWAYDEV=eth0

An error appears: "RTNETLINK answers: File exists".

The output of command "route":

Code:

link-local * 255.255.0.0 U 1002 0 0 eth0
default    * 0.0.0.0     U 0    0 0 eth0

Ping to the default gateway was OK. Ping to the outside was NOK !

The only way to succeed was to manually add a "second" default route:

route add default gw 192.168.1.254 eth0

The output of command "route":

Code:

link-local *               255.255.0.0 U  1002 0 0 eth0
default    *               0.0.0.0     U  0    0 0 eth0
default    static.254.1.16 0.0.0.0     UG 0    0 0 eth0

In fact, the file route-eth0 is not needed. If I delete it, no more error during the restart.

How could you explain that ?

Is there another way to succeed ? Is this method correct ?

The problem is that when I'm disconnecting/reconnecting the network interface, the route is not automatically added...

Thanks,

nini09 · 08-04-2014, 02:38 PM

route-interface file has two formats: IP command arguments and network/netmask directives. You can try IP command argumemts to define device.

IP Command Arguments Format

Define a default gateway on the first line.

default X.X.X.X dev interface

Bob.Sauvage · 08-05-2014, 08:02 AM

Thanks but I've already tried...

In this case, this error appears:

Error: either "to" is duplicate, or "192.168.1.254" is a garbage.

nini09 · 08-05-2014, 02:49 PM

I use network manager to config host interface, mask is 255.255.255.255. Everything is fine, be able to ping default gateway.
No /etc/sysconfig/network-scripts/route-eth0
No /etc/sysconfig/network
Only /etc/sysconfig/network-scripts/ifcfg-eth0
IPADDR0=192.168.1.10
PREFIX0=32
GATEWAY0=192.168.1.254

Bob.Sauvage · 08-06-2014, 05:50 AM

I deleted files route-eth0 & network. I've configured ifcfg-eth0 like you said (I had to add DEVICE=eth0) and it doesn't work...

[root@xxx network-scripts]# service network restart
Shutting down interface eth0: [ OK ]
Shutting down loopback interface: [ OK ]
Bringing up loopback interface: [ OK ]
Bringing up interface eth0: Determining if ip address 192.168.1.1 is already in use for device eth0...
[ OK ]
[root@xxx network-scripts]# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
link-local * 255.255.0.0 U 1002 0 0 eth0
[root@xxx network-scripts]# ping 192.168.254
connect: Network is unreachable

Which distribution are you using ?

nini09 · 08-07-2014, 02:40 PM

I am using Fedora 20. Do you have network manager in your distribution? It is better to use network manager to configure interface. Anyway, I attach my ifcfg-p4p1.

TYPE="Ethernet"
BOOTPROTO=none
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="p4p1"
UUID="xxxxxx"
ONBOOT="yes"
IPADDR0=192.168.1.10
PREFIX0=32
GATEWAY0=192.168.1.254
HWADDR=xxxxxxxxx
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes