Hi, I ran into this issue last night when I was testing out a trivial VPN config & assumed it may have been related to virtualbox but I've just replicated it on a ThinkPad X60s.
panic: ipintr no HDR Stopped at Debugger+0x7: leave Tid PID UID PRFLAGS PFLAGS CPU COMMAND 21363 21363 82 0x10 0 1 npppd Debugger ( ) at Debugger+0x7 panic( ) at panic+0x71 ipintr( ) at ipintr+0x34 netintr( ) at netintr+0x78 softintr_dispatch(1) at softintr_dispatch+0x5f Xsoftnet() at Xsoftnet+0x12 screenshots from a -current #1575 running an a guest http://sevan.sdf.org/trace-58current.png http://sevan.sdf.org/ps1.png http://sevan.sdf.org/ps2.png http://sevan.sdf.org/ps3.png Confirmed issue on 5.8-RELEASE amd64, the -current snapshot from yesterday #1575 (2/12/2015) (SP kernel) on virtualbox 5 and the i386 snapshot from 14/11/2015 #1378 (SMP kernel) on a ThinkPad X60s. In each case no changes were made to the default OpenBSD install other than assigning a IP address to network interface, adding a user to /etc/npppd/nppd-users & adding a ipsec.conf. ipsec.conf: ike passive esp transport proto udp from 1.2.3.4 to any port 1701 \ main auth "hmac-sha1" enc "3des" group modp1024 psk "password". (have to use these crypto settings because it's not possible to connect from a manually configured VPN on OS X otherwise, it's just for my testing purposes to "succeed", not what's used in production). Run: isakmpd -K ipsecctl -f /etc/ipsec.conf npppd On OS X (tested with 10.11.1) System Preferences > Network, add a L2TP over IPsec VPN, fill in the username, password & psk. hit connect. Upon establishing a connecting succesfully, OS X will start the timer & display the I/O indicator at which point OpenBSD will have panicked. Sevan / Venture37
