cannot ping but can ssh and http

[JacksonZheng]

Host: Windows 10 Guest: Centos 5 Network: NAT

Why: cannot ping in guest, but can http or ssh.

Debug:

1. Use tcpdump in guest and host, will see icmp request is sent to host and host resent this packet to the target, but after got icmp reply, host will try to resent reply to 10.96.1.19, then return "unreachable network"
2. Try to capture virtual machine packet by(there is only lo0 and eth0 interface in my guest):

   VBoxManage.exe modifyvm "redhat32" --nictrace1 on --nictracefile1 c:\Users\xxxx\netlog.pcap
   

   But nothing is logged.

[Valery Ushakov]

Please, provide the VM's .vbox file and VBox.log from the run that exhibits the problem.

Please, provide the actual packet captures from the host and the guest.

When you enable nictrace, is the capture file not created at all or is it created but empty?

[JacksonZheng]

this is ping ok case

[JacksonZheng]

this issue seems gone, don't know why?

[JacksonZheng]

nothing is logged, but the file is created.

[JacksonZheng]

This issue didnot exist today.see (vbox.log). And I forget to save wireshark capture file.

[JacksonZheng]

Seems some different in vbox.log.1

00:00:05.612296 NAT: Zone(nm:mbuf_cluster, used:0) 00:00:05.613067 NAT: Zone(nm:mbuf_packet, used:0) 00:00:05.613087 NAT: Zone(nm:mbuf, used:0) 00:00:05.613266 NAT: Zone(nm:mbuf_jumbo_pagesize, used:0) 00:00:05.614023 NAT: Zone(nm:mbuf_jumbo_9k, used:0) 00:00:05.614425 NAT: Zone(nm:mbuf_jumbo_16k, used:0) 00:00:05.614656 NAT: Zone(nm:mbuf_ext_refcnt, used:0)