02-29-2016
Server setup for multiple IP routing?
Hey there,
I am a network administrator of a student dorm. Me and my team (we do this in our spare time) have the task to upgrade and rebuild our dorm intern network. But unfortunately we don't have that much experience with server setup and ip-routing and stuff. So here is the topic I want to ask you about:
Currently our users can connect one device, which is addressed with a static ip-address (so we have quite few external ip addresses). Our boss wants us, to set up a few access points, so that the users can use wifi, provided by us. So far, so good. But we don't have as many ip addresses as we would need to cover at least 2 devices per user. So we thought about this and came up with a idea, to use our server as a router for 400+ ips. So that each student has its own private network with local ip-addresses, routed to one external ip address, special for each user.
So for example it would look like this:
User 1: (192.168.0.100;192.168.0.10)=>153.126.30.101=>Gateway=>Internet
User 2: (192.168.0.101;192.168.0.50)=>153.126.30.102=>Gateway=>Internet
...
User 479: (192.168.0.103;192.168.0.105;192.168.0.161)=>153.126.31.249=>Gateway=>Internet
User 480: (192.168.0.107;192.168.0.150)=>153.126.31.250=>Gateway=>Internet
Is this possible and if yes, do you have some advice what we should have a look into? Or can you even explain, what would be the best way to achieve this?
Best regards,
mrgruen
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LEARN ABOUT SUSE
ifndp-proxy
IFNDP-PROXY(5) Network configuration IFNDP-PROXY(5)
NAME
ifndp-proxy[-<interface name>] - IPv6 NDP and IPv4 ARP proxy entries
SYNOPSIS
/etc/sysconfig/network/ifndp-proxy
/etc/sysconfig/network/ifndp-proxy-<interface name>
DESCRIPTION
These files contain IPv6 NDP and IPv4 ARP proxy settings, that should be applied using the ip neigh add proxy command documented in the
ip(8) manual page that provides a common interface for IPv4 and IPv6.
The NDP/ARP proxy is required, e.g. when IP addresses from the same subnet have to be used on the interface of the host as well as on
interfaces behind a (tunnel) interface and using a bridge is not an option.
Don't forget to enable forwarding and the NDP/ARP proxy by setting
net.ipv6.conf.<all|default|interface name>.proxy_ndp = 1
net.ipv6.conf.<all|default|interface name>.forwarding = 1
and/or
net.ipv4.conf.<all|default|interface name>.proxy_arp = 1
net.ipv4.conf.<all|default|interface name>.forwarding = 1
or
net.ipv4.ip_forward = 1
either as global all setting in the /etc/sysctl.conf file or using the ifsysctl(5) files, that allow per-interface setup.
Forwarding can be also enabled in the /etc/sysconfig/sysctl file using the IP_FORWARD and IPV6_FORWARD variables.
The proxy entries are added and deleted using the if-{up|down}.d/ndp-proxy script, every time after an involved interface has been set
up or down.
SYNTAX
The format of the ifndp-proxy file is:
<address> <address interface> <proxy interface list>
The format of the ifndp-proxy-<address interface> file is same to above, but allows also to omit the address interface by using a "-" as
placeholder inside of the file, because it is already available in the file name:
<address> <address interface | -> <proxy interface list>
Lines beginning with # and blank lines are ignored.
Each line defines to add a proxy NDP/ARP entry with the address of or behind address interface to all interfaces in the proxy interface
list.
EXAMPLES
Let's assume, your machine is connected via eth0 to a switch with the networks 2001:db8:abba::/64 and 192.168.100.1/24 and is using the IP
address 1 itself. You'd like to use the addresses 11 and 12 e.g. for virtual machines behind the tap1 and tap2 interface, that is:
2001:db8:abba::1/64 -- local eth0 address
2001:db8:abba::11/64 -- address behind tap1
2001:db8:abba::12/64 -- address behind tap2
192.168.100.1/24 -- local eth0 address
192.168.100.11/24 -- address behind tap1
192.168.100.12/24 -- address behind tap2
then set up the following entries in the ifndp-proxy file:
2001:db8:abba::1 eth0 tap1 tap2
2001:db8:abba::11 tap1 eth0 tap2
2001:db8:abba::12 tap2 eth0 tap1
192.168.100.1 eth0 tap1 tap2
192.168.100.11 tap1 eth0 tap2
192.168.100.12 tap2 eth0 tap1
additionally to the routing entries in the routes or ifroute-<interface name> files.
BUGS
Please report bugs at <https://bugzilla.novell.com/>
AUTHOR
Marius Tomaschewski <mt@suse.de>
SEE ALSO
ifup(8) ifcfg(5) ifsysctl(8)
sysconfig December 2009 IFNDP-PROXY(5)