[lug] sendto(2) problem with ipv4/ipv6 addresses...
zlynx at acm.org
Mon Apr 2 12:55:06 MDT 2012
On Mon, 2012-04-02 at 12:38 -0600, Alan Robertson wrote:
> As part of the Assimilation Monitoring project (assimmon.org), I've
> been writing some UDP network code to send packets. It seems to work
> fine when sending to the ipv6 loopback address (::1), but not when
> sending to ipv4 addresses. I'm sending to ipv4 addresses by using the
> ipv4 part of the ipv6 address space ("::ffff:aa.bb.cc.dd"). Tcpdump
> is showing that nothing is being sent - so the kernel is blocking this
> call before it goes out.
I believe that using IPv4 addresses mapped in IPv6 requires a gateway
device to convert the protocol from IPv6 to IPv4. This seems to be
Here is one source I Googled that describes configuring it on Linux:
Knowledge Is Power
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