Re: Why unidirectional ping in LAN?
- From: "Steve Winograd [MVP]" <winograd@xxxxxxxxx>
- Date: Tue, 26 Jul 2005 18:48:58 -0600
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
One possibility is that a firewall program on the laptop is blocking
pings.
I assume that the routers have built-in switches, not hubs. Hubs
repeat an incoming packet on all of their ports, but switches don't.
Switches can tell which specific port to use for sending a packet.
--
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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- Why unidirectional ping in LAN?
- From: Chris Shearer Cooper
- Why unidirectional ping in LAN?
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