Here's the IPCONFIG syntax in Win2k:
Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.
C:\Documents and Settings\Administrator>IPCONFIG /?
Windows 2000 IP Configuration
USAGE:
ipconfig [/? | /all | /release [adapter] | /renew [adapter]
| /flushdns | /registerdns
| /showclassid adapter
| /setclassid adapter [classidtoset] ]
adapter Full name or pattern with '*' and '?' to 'match',
* matches any character, ? matches one character.
Options
/? Display this help message.
/all Display full configuration information.
/release Release the IP address for the specified adapter.
/renew Renew the IP address for the specified adapter.
/flushdns Purges the DNS Resolver cache.
/registerdns Refreshes all DHCP leases and re-registers DNS names
/displaydns Display the contents of the DNS Resolver Cache.
/showclassid Displays all the dhcp class IDs allowed for adapter.
/setclassid Modifies the dhcp class id.
The default is to display only the IP address, subnet mask and
default gateway for each adapter bound to TCP/IP.
For Release and Renew, if no adapter name is specified, then the IP address
leases for all adapters bound to TCP/IP will be released or renewed.
For SetClassID, if no class id is specified, then the classid is removed.
Examples:
> ipconfig ... Show information.
> ipconfig /all ... Show detailed information
> ipconfig /renew ... renew all adapaters
> ipconfig /renew EL* ... renew adapters named EL....
> ipconfig /release *ELINK?21* ... release all matching adapters,
eg. ELINK-21, myELELINKi21adapter.
>-----Original Message-----
>From: Simon Bolduc
>Sent: Wednesday, December 19, 2001 11:37 PM
>Subject: Re: [Leaf-user] Update: AT&T Transition Woes
>
>
>Sorry that I haven't been following this thread from the get go but here
>goes:
>
>I know certain ISPs cache the MAC address of the PC that is connected - I
>believe that the head end modems at the ISP end can be set up to cache them
>for different periods of time - possibly even to what would appear to be a
>completely static setting. From working at an @home ISP I know that
>generally the IP was statically mapped back to your host id (or client-id
>depending on the ISP vernacular) - but this had some drawbacks (say someone
>is set up with a static IP cause the @home dhcp servers are flaky and then
>the IP block gets reconfigured - IP address conflict). From what I
>understand, at least the ISP I used to work for, MAC to IP mapping that is
>cached for 3 days has been implemented. A situation similar to yours
>happened to a friend of mine - he never got a valid lease much like yourself
>- and the IP being offered was strange as well - came from some DHCP server
>way out on the @home network... The 3 day cache thing is a pain - but it
>has a solution:
>
>IF this is the problem effecting you - connect the 2K box that works to the
>Modem, and release your IP ( start -> run -> ipconfig /? ) I'd give you the
>exact syntax but I'm not sure how ipconfig references your NIC - or what
>model it is. ipconfig /? will give you the correct syntax of the command,
>ipconfig /all will give you your NIC name. After you've done that - unplug
>the 2K box from the hub (just to make sure it doesn't decide to request its'
>IP again). Plug in your router and hopefully you'll get a valid lease.
>
>If this doesn't work - call AT&T tech supp. Ask about MAC caching on the
>Router/Headend modem - if 1st level support doesn't know the answer, ask for
>2nd level support - either group should be able to tell you about both, and
>if they are using proper troubleshooting tools (well at least the ones I
>used) they should be able to tell you if you currently have a lease.
>
>S
>
>****Note**** Dhclient 2 (the version on Dachstein) does not allow you to
>release your IP - so if you decide to change NICs in your router - you're
>gonna have to put it in a M$ or *nix box which allows you to release your
>IP.
>
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