Re: IPsec wifi link in ad-hoc mode



Fabrice Delente <fdelente@xxxxxxxxxxxx> writes:

Maxwell Lol <nospam@xxxxxxxxxxx> wrote:
We built an ad hoc network a few years ago. I think we had to
broadcast all packets to work around the issue.

I don't understand, could you explain what you mean?


Well, normally a packet is received by the client when it is addressed
to the client. If you are A, and want to send a packet to B that will
forward it to C, you can't simply put C's IP address as the
destination. B will never see it as the address doesn't match.


But by setting the broadcast bit at the MAC layer, B will receive the
packet, and see that it should go to C.

It's been 5 years. I'm a little fuzzy on the details.

Or else B had to be put in promiscuous mode, so it received all
packets. It was something like that...


.



Relevant Pages

  • RE: Running Ethernet without ARP
    ... This is the overly-short version of how things like the arp ... Again you could use the IP broadcast address and ... and without hand-coded MAC address limiting peer tables, ... receiver endpoint/processor on the public machine, wrap the *entire* packet into ...
    (Linux-Kernel)
  • Re: Newbie help - DHCP
    ... > DISCOVERY packet to UDP port 67. ... Broadcast is needed because the ... > address of the server. ... > the DHCP client daemon is listening. ...
    (comp.os.linux.networking)
  • Re: WakeOnLAN across WAN
    ... The magic packet by definition has a broadcast frame* and is carried ... which LAN port this machine had been on, or by broadcasting it to all ...
    (uk.comp.sys.mac)
  • Re: ipchains log
    ... >explain that the packet was DENYed on interface ppp0. ... >in the TCP header; mostly you can ignore them, ... Source IP of 216.190.255.225 is broadcast address but protocol is not ... Rejected boxes respond ICMP to 62.212.97.194. ...
    (comp.os.linux.security)
  • RE: Win2K Srv sending NBSTAT name query broadcasts to Internet IPs
    ... Time delta from previous packet: ... User Datagram Protocol, Src Port: netbios-ns, Dst Port: netbios-ns ... You are right about broadcast packets, something destined for a specific IP ... to random IP addresses outside of my local network. ...
    (microsoft.public.win2000.networking)