[vbox-dev] Odd networking issue with VirtuaBox

Maarten Hoes hoes.maarten at gmail.com
Wed Jun 17 09:54:57 GMT 2015


On Wed, Jun 17, 2015 at 11:06 AM, Klaus Espenlaub <
klaus.espenlaub at oracle.com> wrote:

> I suspect the very same thing happens for ping6 (the capture only
> contains regular ping, v4).
> Oh im sorry, there's no icmp6 traffic in that particular trace because I
issued no ping6 command in that trace: if I do use ping6, then icmp6 does
show up in the trace. (see the attached
'virtuaboxnic1-icmp6-bridged.pcap.gz' for a VirtuaBox trace that includes

> Do you have a firewall somewhere (host, router) which drops "unknown"
> IPv6 traffic? It can't be a "nothing gets through" case, otherwise the
> router wouldn't respond with the mentioned router advertisement
> immediately after the router solicitation request.
Not that Im aware of, no. The firewalls in place are the default Windows
firewall, and the CentOS firewall, but Im not aware of any such rules in
their default rulesets.

> There are no incoming "Neighbor solicit" messages, but the router could
> of course still remember the details from the earlier communication
> initiated by the VM.
Hrm. I guess I could try rebooting the provider's 'modem' (presumably
clearing any cache) and see if those do show up in that case ?

Just in case it might help, I did a trace on the host nic with
wireshark/pcap while doing a ping/ping6/wget from the Centos guest

- Maarten
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