Re: Why unidirectional ping in LAN?

I've got nothing connected to the WAN port of R2 ... I've got a cable
running from a LAN port on R1 to a LAN port on R2.

I can't get rid of R1 'cuz it's got my VPN and firewall.

Thanks!
Chris


"Steve Winograd [MVP]" <winograd@xxxxxxxxx> wrote in message
news:i82de1hlacbb21f3t966e2a2ru6646h2n2@xxxxxxxxxx
> In article <11ed1htgo7mfo6e@xxxxxxxxxxxxxxxxxx>, "Chris Shearer
> Cooper" <chrisnews@xxxxxxx> wrote:
>>My LAN looks something like this, with R1 = normal router and R2 =
>>wireless router :
>>
>>Internet ----- R ----- Desktop
>> 1 --+
>> |
>>Nothing ------ R --+
>> 2 ----- Laptop
>>
>>The problem I'm trying to figure out, is why the laptop can ping the
>>desktop but not vice-versa.
>>
>>I'm imagining the ping from the laptop hits R2 who notices the destination
>>address is inside the subnet, so he repeats that packet on all his LAN
>>ports, one of which is R1. R1 sees the ping, notices the destination
>>address is inside the subnet, so he repeats the packet on all his LAN
>>ports, one of which is the desktop.
>>
>>So why doesn't it work the other direction? Is the fact that the laptop
>>is connecting wirelessly relevant somehow?
>>
>>Thanks!
>>Chris
>
> You don't say how you've connected the routers to each other. I'm
> assuming that you've connected the WAN (Internet) port of R2 to a LAN
> port of R1.
>
> In that configuration, R2 blocks pings from the desktop to the laptop.
> From the router's point of view, the desktop is part of the Internet,
> not part of the local area network, so it drops the ping request.
>
> The laptop can ping the desktop because R2's WAN (Internet) interface
> has an IP address in the same LAN as the desktop.
>
> If you want the desktop and laptop to be in the same LAN, use R2 as a
> wireless access point only, bypassing its routing capabilities:
>
> 1. Disable its DHCP server.
>
> 2. Assign its LAN interface an IP address in the same subnet that R1
> uses.
>
> 3. Connect a LAN port of R2 to a LAN port of R1.
>
> 4. Don't connect anything to the WAN (Internet) port of R2.
>
> or:
>
> Remove R1 from the network and just use R2.
> --
> Best Wishes,
> Steve Winograd, MS-MVP (Windows Networking)
>
> Please post any reply as a follow-up message in the news group
> for everyone to see. I'm sorry, but I don't answer questions
> addressed directly to me in E-mail or news groups.
>
> Microsoft Most Valuable Professional Program
> http://mvp.support.microsoft.com


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