16.01.2020 23:07, Victor Sudakov wrote: >>> What beats me is that I cannot reproduce this problem in bhyve. In this >>> packet dump: http://admin.sibptus.ru/~vas/ipsec1.pcap.gz I'm scp-ing a >>> 50M file from 192.168.246.10 (bhyve guest) to 192.168.246.1 (bhyve >>> host), and I see no fragments, and the largets packet is 1466 bytes, and >>> the scp never stalls nor fails. >>> >>> Why is it NOT broken this time? >>> >>> Both hosts are 12.1-RELEASE-p1. >> >> I could not reproduce the problem with unpatched recent stable/11, either :-) > > Is there a way to view the MSS in the TCP segments before encryption or > after decryption? I want to compare them in situations with IPSec > enabled and disabled. > > I've never been able to see anything in "tcpdump -i enc0", probably it > cannot do transport mode IPSec because the man page talks about "outer > and inner header."
enc0 does what you need but before you use it, remember: 1) before starting, you better change sysctls to: net.enc.in.ipsec_filter_mask=0 net.enc.out.ipsec_filter_mask=0 so using enc0 does not pass packets over netpfilter rules extra time; 2) don't forget: ifconfig enc0 up 3) tcpdump has no means to filter by inner attributes in case of tunnel mode; it still shows decoded IPSec transport mode packets correctly. _______________________________________________ freebsd-net@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
