Re: SBServer & DHCP

John F Kappler wrote:
(If this post should be in a different group, pls feel free to refer
me there!)

Our SBServer is our first server and we migrated to it from a
peer-to-peer network of static and mobile PCs, plus various routers,
wireless access points and other network boxes.

In the peer-to-peer netwrok,everything that needed it was given a
static IP address, as this seemed to be the fastest vway to get it all
working when a new device was installed (the network grew like
Topsy!).

However, to help the mobile users we're now planning on changing their
Network Adaptors TCP/IP settings to use Get an IP Address
Automatically.

I'm therefore assuming that we use the DHCP service on the SBServer to
issue these IP adresses.

Our SBServer is setup with two network cards, the one on the LAN side
being set at xxx.yyy.0.251, the one on the External side being set at
xxx.yyy.1.251.

Two questions therefore arise:

1) I assume I need to tell the SBServer DHCP service the range of IP
addresses it may issue from (and also check that it is turned on!).
What is the easiest way of finding these controls?

Server Management, Advanced, Computer Management, Services.

2) On the external adaptor, there hangs a router and two modems. All
of these have DHCP facilities. Apart from setting the devices own IP
addresses, I assume I need to turn off the DHCP capability on all
three devices?

The router and SBS external NIC will have static IPs of course, but
it's recommended that the router DHCP be turned on, with a small
pool of addresses. Visitors' laptops can be plugged in there to
give them Internet access without access to your LAN, and DHCP
makes it much easier.

I'm fairly confident that I know understand this part of networking,
but confirmation would be most welcome. I need to make the changes as
seamlessly as possible and a little re-assurance would be good.

Make sure you get *everything*, including any directly networked
printers, etc.

Where you do need to set static IPs, make sure the DHCP pool either
does not overlap them or that reservations are set for them. The latter
is a better idea, as the reservations provide documentation of these
IPs and hardware addresses, which might not exist anywhere else.

If users connect in by VPN, addresses from the main LAN pool will
be used, so do not be tempted to reduce the default pool size to
correspond to the number of nodes you actually have. Two addresses
for each VPN link will be needed, and will normally be reserved at
boot time. Ten addresses are the default for VPN, and this is why
DHCP will show the SBS as using them.
.

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