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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 578b357849
commit c608660d12
7 changed files with 252 additions and 49 deletions
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2
wgengine/router/ifconfig_windows.go
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@ -241,7 +241,7 @@ func interfaceFromLUID(luid winipcfg.LUID, flags winipcfg.GAAFlags) (*winipcfg.I
var networkCategoryWarning = health.NewWarnable(health.WithMapDebugFlag("warn-network-category-unhealthy"))
func configureInterface(cfg *Config, tun *tun.NativeTun) (retErr error) {
var mtu = tstun.DefaultMTU()
var mtu = tstun.DefaultTUNMTU()
luid := winipcfg.LUID(tun.LUID())
iface, err := interfaceFromLUID(luid,
// Issue 474: on early boot, when the network is still