Re: newbie to home network dhcp worries

From: Moon (elmoono_at_yahoo.co.uk)
Date: 01/09/05 

Date: Sun, 9 Jan 2005 15:09:41 -0000

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

-- 
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)

Relevant Pages

  • Re: Small network to Net setup suggestions.
    ... You will be better off spending the $50 for a simple NAT router. ... NAT is incorrectly setup in RRAS, or is not setup at all. ... I have a small critical network I have to get up on ...
    (microsoft.public.win2000.networking)
  • Re: Static Translations Disappearing
    ... this router and see if they have the same behavior. ... you are running into a NAT bug. ... It wouldn't hurt to change IOS and ... ....where it just shows all translations being dynamic (0 static, ...
    (comp.dcom.sys.cisco)
  • Re: moved a working network, now it doesnt work
    ... router I can ping the internet with no problem. ... From one of your Linux machines can you ping the FA 0/1 interface (default ... are NOT natting so if CAN ping from the router, ...
    (comp.dcom.sys.cisco)
  • Re: IP Route Tables - Point to Point Connection - Only Routing 1 way
    ... Your ksshorley1 router is performing network address translation (NAT) on ... default route command. ...
    (comp.dcom.sys.cisco)
  • Re: Cisco 1700 Router
    ... I must consider your modem to be a router which provides PPPoE, DNS proxy ... and NAT services. ... This default route points out interface Ethernet0, ...
    (comp.dcom.sys.cisco)
Loading