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James Tucker e1e22785b4 net/netcheck: ensure prior preferred DERP is always in netchecks ... In an environment with unstable latency, such as upstream bufferbloat, there are cases where a full netcheck could drop the prior preferred DERP (likely home DERP) from future netcheck probe plans. This will then likely result in a home DERP having a missing sample on the next incremental netcheck, ultimately resulting in a home DERP move. This change does not fix our overall response to highly unstable latency, but it is an incremental improvement to prevent single spurious samples during a full netcheck from alone triggering a flapping condition, as now the prior changes to include historical latency will still provide the desired resistance, and the home DERP should not move unless latency is consistently worse over a 5 minute period. Note that there is a nomenclature and semantics issue remaining in the difference between a report preferred DERP and a home DERP. A report preferred DERP is aspirational, it is what will be picked as a home DERP if a home DERP connection needs to be established. A nodes home DERP may be different than a recent preferred DERP, in which case a lot of netcheck logic is fallible. In future enhancements much of the DERP move logic should move to consider the home DERP, rather than recent report preferred DERP. Updates #8603 Updates #13969 Signed-off-by: James Tucker <james@tailscale.com>		1 year ago
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art	all: fix new lint warnings from bumping staticcheck	1 year ago
captivedetection	net/captivedetection: set Timeout on net.Dialer (#13613)	1 year ago
connstats	{net/connstats,wgengine/magicsock}: fix packet counting in connstats	1 year ago
dns	net/dns: fix blank lines being added to resolv.conf on OpenBSD (#13928)	1 year ago
dnscache	net/dnscache: don't fall back to an IPv6 dial if we don't have IPv6	1 year ago
dnsfallback	{control,net}: close idle connections of custom transports	1 year ago
flowtrack	net/flowtrack: fix, test String method	1 year ago
ipset	go.mod: bump bart	1 year ago
ktimeout	net/ktimeout: add a package to set TCP user timeout	2 years ago
memnet	net/memnet: export the network name (#9111)	2 years ago
netaddr	all: update copyright and license headers	3 years ago
netcheck	net/netcheck: ensure prior preferred DERP is always in netchecks	1 year ago
neterror	net/neterror, wgengine/magicsock: use UDP GSO and GRO on Linux (#7791)	3 years ago
netkernelconf	ipn/{ipnlocal,localapi},net/netkernelconf,client/tailscale,cmd/containerboot: optionally enable UDP GRO forwarding for containers (#12410)	2 years ago
netknob	all: update copyright and license headers	3 years ago
netmon	all: fix new lint warnings from bumping staticcheck	1 year ago
netns	net/netns: remove some logspam by avoiding logging parse errors due to unspecified addresses	1 year ago
netstat	all: add test for package comments, fix, add comments as needed	1 year ago
netutil	{ipn,net,tsnet}: use tsaddr helpers	1 year ago
packet	wgengine/magicsock: actually use AF_PACKET socket for raw disco	1 year ago
ping	net/ping: fix ICMP echo code field to 0	2 years ago
portmapper	net/portmapper: don't treat 0.0.0.0 as a valid IP	1 year ago
proxymux	all: cleanup unused code, part 1 (#10661)	2 years ago
routetable	net/{interfaces,netmon}, all: merge net/interfaces package into net/netmon	2 years ago
socks5	net/socks5: support UDP	1 year ago
sockstats	net/sockstats: quiet some log spam in release builds	1 year ago
speedtest	all: update copyright and license headers	3 years ago
stun	ci: enable checklocks workflow for specific packages	1 year ago
stunserver	all: use Go 1.22 range-over-int	2 years ago
tcpinfo	all: use Go 1.22 range-over-int	2 years ago
tlsdial	net/tlsdial: call out firewalls blocking Tailscale in health warnings (#13840)	1 year ago
tsaddr	net/tsaddr: add WithoutExitRoutes and IsExitRoute	1 year ago
tsdial	{control,net}: close idle connections of custom transports	1 year ago
tshttpproxy	all: use Go 1.22 range-over-int	2 years ago
tstun	net/tstun: use /10 as subnet for TAP mode; read IP from netmap	1 year ago
wsconn	go.{mod,sum}: migrate from nhooyr.io/websocket to github.com/coder/websocket	1 year ago