LevelOne WBR-3402TX - Manual (Page 137)

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However, you should add the Authentication Protocol in advanced(Custom
setting) of Security option, like below t o support pap, chap, mschap.
If successfully, we will see:
This time, the client in the internet can ping any pcs in the lan(192.168.123.x)
L2TP
However, the router is the also vpn-l2tp server and supports three Authentication
Protocols, PAP, CHAP and MSCPAP.
And the settings are similar with PPTP. But MS-operating systems, like winxp
win2000 will not find The type of vpn “L2tp”.We can use this files(disableipsec.zip) to enable
it.
http://support.iglou.com/fom-serve/cache/473.html
Then We will see L2tp IPSEC VPN and choose it: