Hello everyone!
Could you help me with UDP truncation problem?
I have three hosts, two on broadband connection, one on 4G (lower MTU).
Judging by tincd logs, MTU discovery works, for example on 4G host:
tincd[4598]: Got MTU probe length 1363
TCP inside the VPN network works fine, but UDP is truncated. By testing
with iperf and dumping traffic I get this:
Between broadband hosts:
20:45:04.259936 IP (tos 0x0, ttl 64, id 52068, offset 0, flags [+],
proto UDP (17), length 1444)
10.2.0.1.5001 > 10.2.0.3.54616: UDP, bad length 1470 > 1416
Between broadband and 4G hosts:
20:48:11.769469 IP (tos 0x0, ttl 64, id 21621, offset 0, flags [+],
proto UDP (17), length 1348)
10.2.0.2.46650 > 10.2.0.1.5001: UDP, bad length 1470 > 1320
ICMP is allowed both inside and outside of tunnels. All hosts are Debian
testing with tinc 1.0.28.
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