One BIG issue is that the machine LMS is running on and your SB2 both
have the same IP address, this is very bad, there is something really
wrong going on here, that should not happen.

I can think of three possible reasons for this:

1) Your DHCP server is messed up

2) you have TWO DHCP servers on your network  (maybe your PC is setup as
a DHCP server?)

3) you have some devices using DHCP and some with fixed addresses, and
ranges overlap

I think a quick tutorial on DHCP is in order

A device  on the network needs an IP address, it can either have one
programmed into the device, known as a static IP address, OR it can get
one at boot time from some other device on the network. 

DHCP is the most popular method of network assigned addresses. The
system consists of a DHCP server (usually  built into the router) that
contains a "pool" of addresses that it assigns to other devices. That
pool is usually a continuous subset of addresses used on your LAN. For
example in your system you are using 192.168.0.xxx, where xxx can be
1->254. The DHCP server is  usually set for some portion  of this, such
as 2->200 or 100->254 etc. The DHCP server should never use the whole
range so  there are some numbers left for you to assign static IPs if
you desire.  

When a device boots up it sends out a message on the LAN saying  "give
me an address". The DHCP server creates a "lease" for this device, it is
an address from the pool AND a length of time it is good for. (on home
servers it is frequently 24 hours, but can be much shorter or longer) If
the lease runs out the device can't talk to other devices. Before the
lease runs out (usually 10 minutes before) the device tries to
renegotiate the lease with the server. 

IF the server is working right and all devices are using DHCP you should
never have two devices with the same address. IF you use static
addresses it is your responsibility to make sure you don't give any two
devices the  same address AND that you make sure you assign addresses
outside of the pool used by the DHCP server.

As mentioned above this goes out the window if you have TWO DHCP servers
on the LAN. When a device requests a lease, it just sends out the
message and waits for a response, if there are two servers that have
overlapping pools, it's very easy to get address conflicts, if both
servers reply to the request the device uses one and not the other, the
two servers don't communicate with each other, they both think they are
the only ones on  the LAN.

Normally your only DHCP server is in your router so it's not a problem.
BUT it is also possible to setup a PC as a DHCP server (it's something
like network sharing, I don't remember the exact name). You might want
to check and see if that is setup on your PC. Another possibility is
having a modem that has a bultin DHCP server AND a separate router that
has a DHCP server. Some DSL, cable modems etc actually contain routers
and DHCP servers builtin, if you add a separate router after that, you
can wind up with two DHCP servers without knowing it.  If that is the
case you need to turn off one of those DHCP servers.

I know, probably way more info than you ever wanted to know!

It might be a good idea to give us a list of all your networking
equipment (modems, routers, switches, APs etc) and how they are
connected, that will help us figure out what might be  happening here.

John S.


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