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wgengine/router: windows: set SkipAsSource on IPv6 LL addresses

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Link-local addresses on the Tailscale interface are not routable.
Ideally they would be removed, however, a concern exists that the
operating system will attempt to re-add them which would lead to
thrashing.

Setting SkipAsSource attempts to avoid production of packets using the
address as a source in any default behaviors.

Before, in powershell: `ping (hostname)` would ping the link-local
address of the Tailscale interface, and fail.
After: `ping (hostname)` now pings the link-local address on the next
highest priority metric local interface.

Fixes #4647
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2022-06-14 11:16:01 -07:00
committed by James Tucker
parent 8c5c87be26
commit 76256d22d8
2 changed files with 31 additions and 27 deletions
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5
wgengine/router/ifconfig_windows_test.go
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@@ -163,11 +163,6 @@ func TestDeltaNets(t *testing.T) {
b: nets("100.84.36.11/32[4]"),
wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
},
{
a: excludeIPv6LinkLocal(nets("100.84.36.11/32", "fe80::99d0:ec2d:b2e7:536b/64")),
b: nets("100.84.36.11/32"),
wantDel: nets("fe80::99d0:ec2d:b2e7:536b/64"),
},
{
a: []*net.IPNet{
{