Seeing Linux boxes over VPN

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I am having issues with a remote office. Using DHCP over VPN the users could see all of the Linux boxes and Windows boxes at my site. Doing this caused an issue with my Nortel BCM I couldn't get to it from the main office which tends to be an issue with IP phones. So now I had to change the remote office's DHCP to come from there local server using its own IP range the issue now is that the computers can not get to the 3 linux boxes at the main office they can get to the M$ servers and even local computers. Any idea?

thanks
John

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Looking at "route" since the recent change put the remote office onto a different IP range would that IP range need to be added to the eth0