Update gokrazy

go.mod

@@ -2,7 +2,7 @@ module github.com/rtr7/router7
 
 go 1.13
 
-replace github.com/gokrazy/gokrazy => bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc
+replace github.com/gokrazy/gokrazy => bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200902065731-7b8bf9bc8266
 
 require (
 	github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883

go.sum

@@ -1,5 +1,5 @@
-bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc h1:8dSoG9r/UydbDre0bV/oWef5zkPZVTf2CuEITPgWXqU=
-bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200822174213-684b7f10bbcc/go.mod h1:gg6WuqKqQT5Ty8vivqW/UUwyinbpjNpiaQJyAHDUquY=
+bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200902060713-63d3ed56d6a1 h1:j6eK/6nuJ7H3J/8BZn753XP3SzOBGt73b7wHxRCMhAo=
+bombur.narnian.us/git/lordwelch/gokrazy v0.0.0-20200902060713-63d3ed56d6a1/go.mod h1:gg6WuqKqQT5Ty8vivqW/UUwyinbpjNpiaQJyAHDUquY=
 cloud.google.com/go v0.26.0 h1:e0WKqKTd5BnrG8aKH3J3h+QvEIQtSUcf2n5UZ5ZgLtQ=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=

internal/dhcp4/dhcp4.go

@@ -51,6 +51,8 @@ type Client struct {
 	timeNow      func() time.Time
 	generateXID  func() uint32
 
+	timeoutCount int
+
 	// last DHCPACK packet for renewal/release
 	Ack *layers.DHCPv4
 }
@@ -130,9 +132,11 @@ func (c *Client) ObtainOrRenew() bool {
 	if err != nil {
 		if errno, ok := err.(syscall.Errno); ok && errno == syscall.EAGAIN {
 			c.err = fmt.Errorf("DHCP: timeout (server(s) unreachable)")
+			c.timeoutCount++
 			return true // temporary error
 		}
-		if err == errNAK {
+		if err == errNAK || c.timeoutCount > 3 {
+			c.timeoutCount = 0
 			c.Ack = nil // start over at DHCPDISCOVER
 		}
 		c.err = fmt.Errorf("DHCP: %v", err)