Should make no difference as long as you know proper private LAN IP ranges, other than ease of troubleshooting if you have to ask them and they follow their scripts. I am using a 172.16.x.x range. The entire 10.x.x.x range is private, but active range depends upon netmask.
Well didn't have to ask them then, the tech asked which ip range i was using, then he goes oh always use 192.1.168 (not sure why he said that) but that's when i switched it back, think was saying it could cause connection issues, since it was connection issue i was calling on that time.
Ended up being work was being done on the Remote Terminal, and didn't really even need to call