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Windows is adding a route for a local address ( - my fileserver) with a gateway of ( - this is my gateway), the gateway only has a 100Mbs link so all of my fileserver bound traffic is being reduced to 100mbs, if I unplug the gateway it jumps back upto 1000mbs.

The fileserver also functions as the DHCP (isc) server (i am booting from iSCSI with IET and iPXE).

Also the machine with the strange route is configured via dhcp.

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More information is needed to get help. At least, we need to know more details about your network setup. For example, are you using a mask of /8, /16, /32, or something else? – Khaled Apr 2 '12 at 7:16
The subnet mask is /24 – Luke Apr 2 '12 at 7:24
What does your network look like physically? A switch with everything connected to that, or is it more complex? – Chris McKeown Apr 2 '12 at 9:10
@ChrisMcK everything (just the fileserver and the windows 7 client - the router plugs in this switch also) is connected to a simple unmanaged cisco 1Gb switch. – Luke Apr 2 '12 at 11:15
@LukeJurgs Does the static route get removed when the router is turned off? – Chris McKeown Apr 2 '12 at 11:19
up vote 5 down vote accepted

If anyone is interested, after hours of scouring google:

If you are using iPXE - like me, put:

option routers;

where is the iscsi target, like so:

if exists user-class and option user-class = "iPXE" {
  option routers;
  filename "";
  option root-path "";

in the hardware address specific isc-dhcp entry. Outside of this conditional statement you will still need to specify the network router/gateway so the iscsi boot machine can reach the the lan/wan/internet.

Windows creates an undelete-able unchange-able route that corresponds to the iSCSI target when booting from it in the routing table, whatever gateway option is set with the target is bound to the route.

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