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LAN traffic leaking on to WAN

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Special Forums IP Networking LAN traffic leaking on to WAN
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Old 12-13-2011
LAN traffic leaking on to WAN
Network map:

WAN external interface 192.0.0.0 network
|
WAN internal interface 192.0.3.0 network
|
192.0.3.0 LAN
|
wireless router 192.0.3.1
|
DSL modem 192.0.3.2

The problem I am having is that some traffic from the 192.0.3.0 LAN seems to be "leaking" onto the 192.0.0.0 WAN. I noticed this when I installed a NAS on the network. I mapped a drive on a pc to a NAS share. When the backup program starts running, the frame WAN (192.0.0.0) starts dropping packets and the ping times go ridiculous high. When I stop the backup, the WAN traffic and ping times normalize again...

I have a static route in the DSL modem that points 192.0.3.0 to 192.0.0.0 because I need SOME traffic to go over the WAN (a windows shared printer). The rest of the time the frame WAN is only used for some serial printers that our Unix server talks to over the WAN (192.0.0.0).

I have a VPN in place now, so I do not need the 192.0.3.0 traffic to go over the WAN at all now. However, when I remove the static route from the DSL modem my serial printers stop receiving jobs from our Unix server on the other side of the WAN??? Why do my serial printers need the 192.0.3.0 network to talk? Aren't they separate from the LAN? They don't even have network cards for christ sake.
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LEARN ABOUT FREEBSD

nos-tun

NOS-TUN(8)						    BSD System Manager's Manual 						NOS-TUN(8)

NAME

     nos-tun -- implement ``nos'' or ``ka9q'' style IP over IP tunnel

SYNOPSIS

     nos-tun -t tunnel -s source -d destination -p protocol_number [source] target

DESCRIPTION

     The nos-tun utility is used to establish an nos style tunnel, (also known as ka9q or IP-IP tunnel) using a tun(4) kernel interface.

     Tunnel is the name of the tunnel device /dev/tun0 for example.

     Source and destination are the addresses used on the tunnel device.  If you configure the tunnel against a cisco router, use a netmask of
     ``255.255.255.252'' on the cisco.	This is because the tunnel is a point-to-point interface in the FreeBSD end, a concept cisco does not
     really implement.

     Protocol number sets tunnel mode.	Original KA9Q NOS uses 94 but many people use 4 on the worldwide backbone of ampr.org.

     Target is the address of the remote tunnel device, this must match the source address set on the remote end.

EXAMPLES

     This end, a FreeBSD box on address 192.168.59.34:

	   nos-tun -t /dev/tun0 -s 192.168.61.1 -d 192.168.61.2 192.168.56.45

     Remote cisco on address 192.168.56.45:

	   interface tunnel 0
	   ip address 192.168.61.2 255.255.255.252
	   tunnel mode nos
	   tunnel destination 192.168.59.34
	   tunnel source 192.168.56.45

AUTHORS

     Nickolay N. Dudorov <nnd@itfs.nsk.su> wrote the program, Poul-Henning Kamp <phk@FreeBSD.org> wrote the man-page.  Isao SEKI
     <iseki@gongon.com> added a new flag, IP protocol number.

BUGS

     We do not allow for setting our source address for multihomed machines.

BSD
								  April 11, 1998							       BSD