[srsran-users] ppp chap authentication - srsue 21.10

[alexander.serkin at gmail.com]

Hi all

I see that srsue calculates wrong chap response in case of ppp lcp
re-authentication.

Can you help me debugging the issue ? Does srsuse support PPP
authentication?

The setup is the following

srsUE<zeroMQ>srsENB<Cisco vEPC><l2tp tunnel><LNS>

When l2tp session is activated on LNS, it sends chap challenge to the UE,

srsue responds with chap response and after that we get authentication
failed.

I did chap calculations with small python script and I see that the chap
response from my calculator differs from the one returned by srsue.

Attaching pcap file showing the session - this was taken between EPC(LAC)
and LNS. See packets 16-20.

But you probably prefer to see what's going on srsUE itself - here I'd need
some hints on getting the appropriate debugs.

 

Cheers,

Alex

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