Re: Linksys Router and VPN

From: Leythos (void_at_nowhere.com)
Date: 12/24/03 

Date: Wed, 24 Dec 2003 14:16:28 GMT

In article <bXbGb.57275$pY.979@fed1read04>,
FreeOfSpam_wendikun@NO_SPAM_hotmail.com says...
>
> > If you don't initiate an OUTBOUND VPN, all packets (VPN) will be dropped
> > - you have to start the VPN outbound through the router for it to PASS-
> > THROUGH, once you start it it knows where you are.
> >
> In that case, I really don't have to configure anything at all. However, I
> just can't get the VPN/WinCE machine to work with the router. If I bypass
> the router I can connect to the office no problem at all. Does the IP in the
> VPN box need to match with the public IP in the router?

Sorry, I'm not understanding your VPN box for the WinCE machine - I
don't understand what the VPN Box actually is.

You do not use the PUBLIC IP address for anything connected to the
inside (LAN) of the router - it would mess things up if you did that.
Use the built-in DHCP method of the router to assign your IP address to
devices behind the router.

> > The cable modem, with only 1 IP, will sync to the first MAC address it
> > sees - this means that if you connect (after a power cycle) with your
> > PC, then switch to the Linksys, you will have to power cycle it - it
> > will remember the MAC address and save it until a power cycle.
> >
> If DHCP were used (for both the internal network and the ISP), does that
> mean that for every request, each device would try to obtain a new IP from
> the next chain up (PC from router, router from modem, modem from ISP). Or,
> somehow the MAC addr is coming into play -- when each device sees the same
> MAC addr, it won't try to change the IP. But, then how does each device
> (router, modem, ISP) decide when to obtain a new IP? I guess I'm trying to
> figure out how they relate to each other.

In essence, that's how DHCP works - each device connects to the network,
sends out a request for a DHCP server, during the conversation the
server says "I remember you" and assigns the same IP to the device. The
exception comes in where the "lease" time has elapsed (meaning that each
DHCP assigned address has a given time before it will lapse if not used,
this returns it to the pool so that it can be reused by another device).

With cable modems, the five brands that I've used, they all sync on the
router(device) MAC address once they connect. Since the router is always
on, and it set to ask for "renew" of the lease every 24 hours (this can
change), the cable modem won't let any other device connect using that
IP address - when you power cycle the cable modem it looses it's memory
of the MAC and will let you connect another device.

I have a network here in my home, the "lease" time for DHCP addresses is
7 days, at 3.5 days they clients (workstations) will renew their leases.
If I were to disconnect a laptop for a 8 days, it's very possible that I
could get a new, different, IP address when I reconnect it. This same
thing happens with any DHCP system. 

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