Any routers that allow mapping of MAC to DHCP

A

amit das

I am running XP, currently have a networkeverywhere(linksys) router.
The problem is that when power is lost to the router all the DHCP
clients are assigned different ips from before the loss of power. I am
guessing the first computer it sees is the one it gives the first ip
to.. and so on.

This causes a problem because I have port forwarding enabled and when
the router restarts after power loss there is no gaurantee the same
lan computer will get the same DHCP ip.

Is there a home router that will allow me to specify a DHCP address to
a MAC address this way the lan computer will always get the predefined
DHCP ip?

Amit
 
A

amit das

I forgot to mention that I get a dynmically allocated
ip address from my cable provider... so is it still possible to
statically assign my lan pcs even when the main ip address, and dns
keep changing? I was told to
keep all my windows tcp/ip settings to "obtain
automatically"

amit
 
B

Boyd Williston

(e-mail address removed) (amit das) wrote in
I forgot to mention that I get a dynmically allocated
ip address from my cable provider... so is it still possible to
statically assign my lan pcs even when the main ip address, and dns
keep changing? I was told to
keep all my windows tcp/ip settings to "obtain
automatically"

amit
Click to expand...
<snip>

You were told that by a cable provider who was assuming that you had a
computer connected directly to the modem -- or a tech who doesn't know
very much about how a LAN works. The WAN side of you router has to be set
up to get an IP from the cable system (sounds like it is). You can set up
the LAN side however you want. So yes, you can assign static local IP's to
your computers.
 
A

amit das

Ok. as I try to change my xp tcp/ip conf. from obtain auto. to fixed
ip, XP asks for a DNS server, it seems mandatory. after restart the
router now finds my fixed ip computer but the computer cannot connect
to the internet due to lack of dns settings. Does this mean I have to
set the DNS on each computer. Suppose my cable provider changes dns
servers on me.. does this mean I have to change each computers tcp/ip
settings... this is what I do not want to do!

amit
 
J

James Knott

amit said:
Suppose my cable provider changes dns
servers on me.. does this mean I have to change each computers tcp/ip
settings... this is what I do not want to do!
Click to expand...

It's unlikely that will happen very often.

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.
 
J

Jim Orfanakos

Why not use static ip's at the pc level?

: I am running XP, currently have a networkeverywhere(linksys) router.
: The problem is that when power is lost to the router all the DHCP
: clients are assigned different ips from before the loss of power. I am
: guessing the first computer it sees is the one it gives the first ip
: to.. and so on.
:
: This causes a problem because I have port forwarding enabled and when
: the router restarts after power loss there is no gaurantee the same
: lan computer will get the same DHCP ip.
:
: Is there a home router that will allow me to specify a DHCP address to
: a MAC address this way the lan computer will always get the predefined
: DHCP ip?
:
: Amit
 
J

Jacob Westenbach

amit das said:
Ok. as I try to change my xp tcp/ip conf. from obtain auto. to fixed
ip, XP asks for a DNS server, it seems mandatory. after restart the
router now finds my fixed ip computer but the computer cannot connect
to the internet due to lack of dns settings. Does this mean I have to
set the DNS on each computer. Suppose my cable provider changes dns
servers on me.. does this mean I have to change each computers tcp/ip
settings... this is what I do not want to do!
Click to expand...

This is dependent on the router capabilities. I have an Addtron (no longer
in business) which can serve as a DNS proxy for the lan. With it, you
simply point DNS on the client machines to the router IP (same address as
the gateway). If the requested data is not found, the router proxy fetches
the info and caches it.

JW
 
D

Darwei Kung

D-Link DI-713P Wireless Access Point / Router also supports MAC based DHCP
assignment.

By the way for those who suggest static IP address as a solution, consider
the case where a laptop needs to be used at different locations, and must
have different IP addresses. And the location authanticate a computer by a
specific MAC address.

dk.
 
G

Glen Herrmannsfeldt

Darwei Kung said:
D-Link DI-713P Wireless Access Point / Router also supports MAC based DHCP
assignment.

By the way for those who suggest static IP address as a solution, consider
the case where a laptop needs to be used at different locations, and must
have different IP addresses. And the location authanticate a computer by a
specific MAC address.
Click to expand...

Well, BOOTP which came before DHCP was designed to do that.

If you set a long, or infinite, lease time some DHCP servers will reassign
the same address. But then some won't.

-- glen
 
J

James Knott

Darwei said:
By the way for those who suggest static IP address as a solution, consider
the case where a laptop needs to be used at different locations, and must
have different IP addresses. And the location authanticate a computer by
a specific MAC address.
Click to expand...

If you're running Windows 2000 or XP, you can configure it to try dhcp
first, then default to a static IP. With Linux & OS/2, you can start up in
static, then switch to dhcp.

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.
 
J

James Knott

Glen said:
If you set a long, or infinite, lease time some DHCP servers will reassign
the same address. But then some won't.
Click to expand...

Lease time has nothing to do with retaining the same address. The normal
practice is to renew the same IP, as long as possible. Some ISPs don't.

--

Fundamentalism is fundamentally wrong.

To reply to this message, replace everything to the left of "@" with
james.knott.
 

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