Why the journal log records IPv6(::ffff: not IPv4(

Patrick Williams patrick at stwcx.xyz
Fri Feb 21 03:20:41 AEDT 2020

On Thu, Feb 20, 2020 at 04:25:48PM +0800, 常晓明 wrote:
> Hi, Team,
> I enabled the "/xyz/openbmc_project/logging/rest_api_logs" and add the patch code as followed,  the journal log does not record IPv4( but IPv6(::ffff: .

That IPv6 address is the same as the IPv4 address, just in IPv6 format.


Generally, applications that support IPv6 don't [need to] know if they are
being connected to by an IPv4 or IPv6 end-point.  This is how the Linux
networking stack handles IPv6.  When the application indicates it
supports IPv6, the network stack will give it IPv6-formatted addresses
even for IPv4 connections.  This is what you're seeing here.

Patrick Williams
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