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)