UDP connection cause "stream reset"

[NaNi-Z]

What happened:
UDP connection from edge to cloud will cause "stream reset", then UDP connection will not available again, only restart edgemesh on edge node will recover.

I1011 16:55:27.030478 1 proxysocket.go:180] "New UDP connection from client" address="x.x.x.x:50811"
I1011 16:55:27.030514 1 loadbalancer.go:618] "NextEndpoint for service" servicePortName="kube-system/kube-dns-edge:dns" address="x.x.x.x:50811" endpoints=[cloudnode1:coredns-548878875f-77cws:a.a.a.a:53 cloudnode1:coredns-548878875f-zt5v7:b.b.b.b:53]
I1011 16:55:27.030534 1 loadbalancer.go:679] "Mapped service to endpoint" service="kube-system/kube-dns-edge:dns" endpoint="cloudnode1:coredns-548878875f-77cws:b.b.b.b:53"
I1011 16:55:27.030628 1 tunnel.go:278] New stream between peer cloudnode1: {12D3KooWBr91n5RCjPuyxvscZjRDvYXpJQjkkNuDVm9B9BKrewNg: [/ip4/x.x.x.x/tcp/20006/p2p/12D3KooWBr91n5RCjPuyxvscZjRDvYXpJQjkkNuDVm9B9BKrewNg/p2p-circuit /ip4/x.x.x.x/tcp/20006/p2p/12D3KooWKLgcEsqdBpJaT1dcqvLqv8NDwVjkDJMRUBoALwf71CeJ/p2p-circuit /ip4/x.x.x.x/tcp/20006/p2p/12D3KooWDHKkUym46jSG2G5QKNrTpQioqRQeTDz4oiWxAQymi5yp/p2p-circuit /ip4/x.x.x.x/tcp/20006 /ip4/x.x.x.x/tcp/20006 /ip4/127.0.0.1/tcp/20006 /ip4/x.x.x.x/tcp/20006/p2p/12D3KooWDHKkUym46jSG2G5QKNrTpQioqRQeTDz4oiWxAQymi5yp/p2p-circuit /ip4/x.x.x.x/tcp/20006/p2p/12D3KooWBr91n5RCjPuyxvscZjRDvYXpJQjkkNuDVm9B9BKrewNg/p2p-circuit /ip4/x.x.x.x/tcp/20006/p2p/12D3KooWKLgcEsqdBpJaT1dcqvLqv8NDwVjkDJMRUBoALwf71CeJ/p2p-circuit]} success
E1011 16:55:27.031395 1 loadbalancer.go:686] "Dial failed" err="get proxy stream from cloudnode1 error: stream between paas241 reset err: stream reset"

What you expected to happen:
Do not "stream reset"

How to reproduce it (as minimally and precisely as possible):
expose a UDP service to edge, for example, coredns on cloud. Then run this on edge node.

for((i=0;;i++)); do echo $i; nslookup kubernetes.default.svc z.z.z.z; done

z.z.z.z is the ClusterIP of coredns service.
about 230 times you will see.

Anything else we need to know?:

Environment:

• EdgeMesh version:1.13

• Kubernetes version (use kubectl version):1.2.6

• KubeEdge version(e.g. cloudcore --version and edgecore --version):1.13

• Cloud nodes Environment:

  • Hardware configuration (e.g. lscpu):
  • OS (e.g. cat /etc/os-release):
  • Kernel (e.g. uname -a):
  • Go version (e.g. go version):
  • Others:
• Edge nodes Environment:

  • edgecore version (e.g. edgecore --version):
  • Hardware configuration (e.g. lscpu):
  • OS (e.g. cat /etc/os-release):
  • Kernel (e.g. uname -a):
  • Go version (e.g. go version):
  • Others:

[Poorunga]

Traffic monitoring features have been merged: #506

It can help analyze UDP traffic for problems