Re: [PATCH net-next v7] selftests: net: add tests for PPP

[Paolo Abeni <pabeni@redhat.com>]

On 4/2/26 12:13 PM, Qingfang Deng wrote:
> On Thu, Apr 2, 2026 at 5:48 PM Paolo Abeni <pabeni@redhat.com> wrote:
>> Note that similar failures in the past in other test-cases were usually
>> due to timing issues. i.e. the pppoe-server starts in background too
>> late for the client.
> 
> I don't think it is a timing issue, otherwise the PADI negotiation
> won't succeed. The "updetach" option on the client side also make it
> wait for the negotiation.
> It's likely that the pppd instance spawned by pppoe-server fails to
> find the "rp-pppoe.so" plugin, so the connection fails when handing
> off the session from pppoe-server to pppd. Note the naming difference:
> the client loads "pppoe.so", while the server loads "rp-pppoe.so" by
> default.
> 
> What distro do you run CI tests on? On Ubuntu 24.04, "rp-pppoe.so" is
> a symlink to "pppoe.so" in apt package "ppp". Maybe an additional
> package is required for the distro you use, or I may work around that
> by manually creating the symlink.

It's fedora 43 with ppp and pppoe installed.

ppp provides pppoe.so, and AFAICS nothink provides rp-pppoe.so, and the
pppoe-server is looking for a non existing /etc/ppp/plugins/rp-pppoe.so
plugin.

Before I mess with the nipa testbed, could you please double check that

ln -n /usr/lib64/pppd/2.5.1/pppoe.so /etc/ppp/plugins/rp-pppoe.so

should solve?

Thanks,

Paolo