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wgengine,net,ipn,disco: split up and define different types of MTU

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Prepare for path MTU discovery by splitting up the concept of
DefaultMTU() into the concepts of the Tailscale TUN MTU, MTUs of
underlying network interfaces, minimum "safe" TUN MTU, user configured
TUN MTU, probed path MTU to a peer, and maximum probed MTU. Add a set
of likely MTUs to probe.

Updates #311

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-09-22 17:49:09 +02:00
committed by valscale
parent fb2f3e4741
commit 059051c58a
7 changed files with 252 additions and 54 deletions
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2
net/tstun/tun.go
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@@ -44,7 +44,7 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
}
dev, err = createTAP(tapName, bridgeName)
} else {
dev, err = tun.CreateTUN(tunName, int(DefaultMTU()))
dev, err = tun.CreateTUN(tunName, int(DefaultTUNMTU()))
}
if err != nil {
return nil, "", err