RE: wifi broadcast ICMP messages

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From: Vu (Vu_at_discussions.microsoft.com)
Date: 10/26/04

  • Next message: Vu: "ICMP error packet" 
    Date: Tue, 26 Oct 2004 12:19:11 -0700

    "Peter K?hn" wrote:

    > Hi,
    >
    > If I have two Pocket PC's that do not know each other (IP addresses),
    > but only their SSID and subnet masks. There is also no AP available.
    > So the PPC's have to communicate in ad-hoc mode.
    > How is it possible to find each other? In the first moment I would
    > think,
    > sending a broadcast message will solve the problem.
    > But as far as I know it's not possible to send ICMP messages because
    > raw sockets are not implemented in Microsoft Windows CE .NET 4.2
    > and I've heared also that IcmpSendEcho, IcmpSendEcho2 can't be used
    > for broadcast addresses (cannot test it because I have no PPC :-(
    >
    > So my questions are is it true that PPC's can NOT send any broadcast
    > messages and if not how can one solve the "Rendevous-problem" ??
    > Is there a Wifi specific mechanism available?
    >
    > Any practical experiences? Please help.
    >
    Yes, it does send a broadcast. For example, I use 192.168.253.255 and I
    receive the replies from two different hosts on my LAN. But the problem is ,
    on the PocketPC, the returning icmp reply has the address of the one that I
    sent you. IOW, it shows me the reply is from 192.168.253.255.

    The reason I can be sure that my two other hosts receives the icmp broadcast
    is I use tcpdump on these hosts to capture the packets.

    I am not sure if this is a bug. If I find out more, I will post here.

    HTH,

    Vu

  • Next message: Vu: "ICMP error packet"

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