Re: [MirageOS-devel] Mirage unikernels and network setup

[Hannes Mehnert <hannes@xxxxxxxxxxx>]

Hi,

On 02/01/2019 15:51, Armael wrote:
> I'm trying to run the "network" unikernel (from mirage-skeleton [1]) on
> my server, which uses Xen. I'm able to run linux VMs on this server, and
> the network setup seems to be working for them (my main VM is running,
> and I also created a fresh debian VM just to test that).
> However it doesn't seem to be working for mirage unikernels...
> 
> The unikernel starts, but just trying to ping it or connect to it (from
> the dom0) fails.
> 
> I've attached the console log from the unikernel, the tcpdump log, and
> the log from the host.

From the unikernel output:
2018-12-30 15:09:20 -00:00: DBG [application] Establishing or updating
listener for stack mac=00:16:3e:0e:6f:04,ip=10.0.42.20

In your host system, what does "arp -an" report for 10.0.42.20?

2018-12-30 15:09:40 -00:00: DBG [arpv4] notifying: 10.0.42.1 ->
fe:ff:ff:ff:ff:ff

This mac address looks suspicious to me - what is the mac address on the
host system for 10.0.42.1 (you can use "arp -an" to investigate)?

> Interestingly, if I try to ping the unikernel, it seems to receive the
> ping packet, but doesn't reply.
> 
> Would anyone have a clue?

Could you as well debug with "tcpdump -E -i br0 host 10.0.42.20" this
will capture all packets to and from this host, including the ethernet
headers.


hannes

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