Re: newbie to home network dhcp worries

From: Herb Martin (news_at_LearnQuick.com)
Date: 01/09/05 

Date: Sun, 9 Jan 2005 09:29:37 -0600

"Moon" <elmoono@yahoo.co.uk> wrote in message
news:undf21l9EHA.3504@TK2MSFTNGP12.phx.gbl...

> > As long as the private side of both ADSL and BEFSR are different
> > networks you are fine.

No, this is not fine unless the routing has been arranged.
(on the Modem), see below...

> Thanks, i now see why its working, but i will try some of the suggestions
> like running nat just on the router.

NO, you MUST run NAT on at least the Modem(the
most external device) and do not need it on the internal
router.

> > You could setup the BEFSR41 to have a Fixed WAN address, but, you would
> > need to specify the DNS settings. In reality, your setup is not much
> > different than others, both systems get a leased IP from their parent
> > and your traffic is working.
> >

Possibly you will have trouble with the translation,
but not necessarily and you definitely will have an
issue with the ROUTING from the modem to the
internal network behind the Router box. 

-- 
Herb Martin
>
> -- 
> Moon
> "Leythos" <void@nowhere.lan> wrote in message
> news:MPG.1c4b0d61698b8fa2989e68@news-server.columbus.rr.com...
> > In article <O2DrZbj9EHA.3504@TK2MSFTNGP12.phx.gbl>, elmoono@yahoo.co.uk
> > says...
> >> Hi, i have just connected 3 pc's to a Linksys BEFSR41 router, the
router
> >> is
> >> etherneted to a Linksys ADSL2MUE modem. I have changed the routers IP
to
> >> 192.168.2.1 as the modems address is 192.168.1.1
> >> Both these boxes have a dhcp server - and NAT firewalls. My concern is
> >> should both boxes be acting as dhcp servers? if not which one is
> >> prefferable? Should both have the NAT firewall running?
> >> Any advice suggestions appreciated! I have asked on a couple of home
> >> networking forums only to come up with different opinions! some say its
> >> fine
> >> to have both as dhcp servers, others say you should not have both doing
> >> this!
> >> Thanks
> >
> > If I understand you correctly you have this setup:
> >
> > INTERNET <> ADSL2MUE <> BEFSR41 <> Computers
> >
> > With this setup your ADSL get's an IP from the ISP, the BEFSR41 get's
> > and IP from the ADSL unit, and the computers get an IP from the BEFSR.
> >
> > As long as the private side of both ADSL and BEFSR are different
> > networks you are fine.
> >
> > You could setup the BEFSR41 to have a Fixed WAN address, but, you would
> > need to specify the DNS settings. In reality, your setup is not much
> > different than others, both systems get a leased IP from their parent
> > and your traffic is working.
> >
> > Where you may run into trouble is getting inbound traffic from the
> > internet (for games, VOIP, etc...) to work properly through a double
> > NAT. You also need to understand that NAT does not make either of these
> > devices a Firewall, not even close. NAT only blocks unsolicited inbound
> > traffic to your network.
> >
> > In your setup, since the ADSL is using NAT, there should be no
> > unsolicited traffic reaching the BEFSR unit.
> >
> > I would setup the ADSL unit to pass the public IP through to the BEFSR
> > unit, meaning that I would not NAT the public IP at the ADSL unit. I
> > would let the BEFSR unit do the NAT - this way you could install
> > WallWatcher on a PC and enable logs in the router and watch all in/out
> > bound traffic for problems.
> >
> > In summary, as long as both NAT networks are on different subnets
> > (192.168.1.X and 192.168.2.X with a 255.255.255.0 mask) you will have no
> > problems, even with DHCP enabled. Both devices are completely capable of
> > working in a Dynamic mode and will update just fine.
> >
> >
> >
> > -- 
> > -- 
> > spamfree999@rrohio.com
> > (Remove 999 to reply to me)
>
>

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