Are you manually assigning IPs or are you using DHCP?
There must be only one active source for DHCP on a LAN. You can use more but
only if each one is serving IPs for different private IP address ranges. A DHCP
source must be always on, or be turned on and ready before the systems it's
assigning IPs to are turned on. So if your router is the DHCP source and you
turn it off, your computers, printers etc can lose track of one another.
Another method of not manually assigning IPs on each individual computer or
other devices is with a BOOTP server. From a central source you can assign IP
addresses to MAC addresses. 'Course you then need a BOOTP server process
running on an anways or first on computer, or a router/modem with BOOTP
capability - and you get to type in a bunch of MAC addresses.
For my little LAN I manually set the printer's IP addresses but let the
internet router use DHCP to assign IPs to the computers since I'm not currently
doing any file sharing among them.
I also set the printers to high numbered addresses like 192.168.0.186 and
192.168.0.192 so that the DHCP won't do stupid things like assigning a computer
the same IP as a printer. It starts at 192.168.0.2 and increments the last
number up from there.
In my experience with Windows and networking (going back to version 3.0),
Windows has an issue with forgetting where printers are when they have
dynamically assigned IP addresses. Newer versions of Windows have a "dynamic"
network printer option that's supposed to get around that but I haven't tried
it. Setting a fixed IP and installing drivers for each printer on each computer
works and stays working because it's not allowed to be altered by the whims of
software.
From: Rick Lair <r...@superiorroll.com>
To: Emc Users <emc-users@lists.sourceforge.net>
Sent: Monday, March 28, 2016 7:47 AM
Subject: [Emc-users] Way OT: Cannot see Workgroup Computers
In know this is way off topic, but if anybody would possibly know, I'm
sure they are floating around here somewhere,
We have a small network here at the shop, roughly a dozen PC's and 4
CNC's ( my linuxcnc builds) that are all networked together, using a
workgroup type setup, not a domain. Most of the time everything works
fine, but randomly ( right now) when you try to look at one of the other
workgroup computers, there is nothing there. On my wheezy machine I
clicked on the "Network" selection, and then clicked on the "Windows
Network" link, and there is nothing there. So I went back to XP machine,
and went and clicked "View Workgroup Computers", and a popup box comes
up after about 10 seconds that says " The list of servers for this
workgroup is currently unavailable". On both machines, I can access the
internet just fine, I pinged the wheezy machine from my XP machine, and
everything looks fine there, so what could possibly cause it not
see/display the other PC's in the network managers of either machine?
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