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Fix couple of issues with MTU calculations

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Neil Alexander 2019-11-20 22:11:52 +00:00
parent ec46b217da
commit 9fca3640f9
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GPG key ID: A02A2019A2BB0944
2 changed files with 7 additions and 20 deletions
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8
src/tuntap/tun_linux.go
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@ -27,14 +27,6 @@ func (tun *TunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int
}
tun.iface = iface
tun.mtu = getSupportedMTU(mtu, iftapmode)
// The following check is specific to Linux, as the TAP driver only supports
// an MTU of 65535-14 to make room for the ethernet headers. This makes sure
// that the MTU gets rounded down to 65521 instead of causing a panic.
if iftapmode {
if tun.mtu > 65535-tun_ETHER_HEADER_LENGTH {
tun.mtu = 65535 - tun_ETHER_HEADER_LENGTH
}
}
// Friendly output
tun.log.Infof("Interface name: %s", tun.iface.Name())
tun.log.Infof("Interface IPv6: %s", addr)