vcpe/l2tp/xl2tpd/COMPATIBILITY_ISSUES

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* Android 9 & 10 fails on maximum retries exceeded for tunnel
There are reports that with Android 9 & 10, some users are getting "Maximum retries"
error messages. It seems to related to some of the phones not responding to
L2TP keepalive heartbeats
A possible work around is to use the max_retries option. Using "max retries"
in the xl2tpd.conf (e.g. max retries = 100) has known to work for some
users. Alternatively, another works around is to not to enable L2TP
keepalive on the VPN servers.
For more information, please refer to: https://github.com/xelerance/xl2tpd/issues/191
* Issues with Cisco ASA
Some users are reporting that newer version of xl2tpd (1.310 onward) are
not able to connect to Cisco ASA.
A possible work around is to use x2ltpd 1.39 and disable use of kernel module
(comment out the directive OSFLAGS+= -DUSE_KERNEL -D in the Makefile)
For more information, please refer to: https://github.com/xelerance/xl2tpd/issues/187
* AVP is incorrect size issues with Miktrotik server
There are reports of problems connecting to Miktrotik server.
Github user reported that the following configuration works for them:
https://github.com/xelerance/xl2tpd/issues/156#issuecomment-678674101