Description of problem: L2TP VPN connection doesn't work. I can't access any hosts of the remote network. Connecting to the same server from Windows 7/8/10 works fine. dmesg output has a lot of messages like this: [ +30,033294] net_ratelimit: 3 callbacks suppressed [ +0,000005] ppp0: recursion detected [ +0,000045] ppp0: recursion detected [ +0,000048] ppp0: recursion detected [ +0,000057] ppp0: recursion detected [ +0,000072] ppp0: recursion detected [ +0,000084] ppp0: recursion detected [ +0,000096] ppp0: recursion detected [ +0,000184] ppp0: recursion detected [ +0,000165] ppp0: recursion detected [ +0,000184] ppp0: recursion detected Version-Release number of selected component (if applicable): Fedora 25 Linux 4.10.12-200.fc25.x86_64 xl2tpd-1.3.9 Steps to Reproduce: 1. Create a VPN connection to a TP-Link router providing L2TP VPN service 2. Establish connection 3. Wait for dmesg messages to appear Additional info: This issue was causing soft lockups before. It was fixed with the following commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=55454a565836e1cb002d433e901804dea4406a32 Related bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=856655 Logs: dmesg: [ +0,006035] IPv4 over IPsec tunneling driver [ +2,283015] alg: No test for echainiv(authenc(hmac(sha1),cbc(des3_ede))) (echainiv(authenc(hmac(sha1-generic),cbc(des3_ede-generic)))) [ +0,052194] PPP generic driver version 2.4.2 [ +0,004187] NET: Registered protocol family 24 [ +0,007978] l2tp_core: L2TP core driver, V2.0 [ +0,002099] l2tp_netlink: L2TP netlink interface [ +0,002637] l2tp_ppp: PPPoL2TP kernel driver, V2.0 systemd journal: https://paste.fedoraproject.org/paste/zJ87OrtKCB4pZzczDGGclV5M1UNdIGYhyRLivL9gydE=
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Can you still reproduce this? If so what kernel version? Some people reported issues with 4.14 and some 4.13 kernels with backports and that it broke l2tp/ipsec
Have someone using NetworkManager-l2tp 1.2.8 who reported an issue with kernel 4.14.3 and 4.14.5, but not with some 4.13 kernels, see: https://bugzilla.redhat.com/show_bug.cgi?id=1526203 Upstream libreswan report : https://github.com/libreswan/libreswan/issues/140
also 4.15.0 seems to work fine?
On Fedora 27 can confirm I'm able to establish a L2TP/IPsec connection with kernel-4.15.0-0.rc3.git0.1.fc28. Unfortunately kernel-4.14.6-300.fc27 in testing still has the issue.
I see this on Fedora 30 with pppoE in use in pppd.