Host sends multiple ARP replies ???

[nok]

Hi all

I have a really weird problem I hope somebody can help me with. I have an Ubuntu 9.10 guest running on an Ubuntu 12.04.2 host, VirtualBox 4.3.2. Host-Only interface. The host has 172.20.0.1 as IP-address and the guest has a static IP-address 172.20.0.19.
When the guest asks for the MAC address of the host (I use a NFS filesystem on the host), the host sends 2 ARP replies, the first with 08:00:27:36:33:35 and the second with 0a:00:27:00:00:00. The guest catches the first response and is hung since the host doesn't answer on the first MAC-address.
If I run "arp -s 172.20.0.1 0a:00:27:00:00:00" everything works, at least until the guest flushes the arp buffer and requests the arp address of the host next time.
I have another guest, an old Mandrake installation, which experience the same problem.

If I'm not mistaken the mac address 08:00:27:36:33:35 is a mac address used by VirtualBox in previous versions. My VirtualBox installation has existed since 3.2 or something like that. The problem hasn't been there always. It appeared sometime after 4.0.

Anybody got a clue or better, a solution ?

[gyrovague]

A year late for your post, but I ran into this same thing yesterday. Annoying, I can't post a link to that post here yet due to forum rules, but you can find it by doing search, advanced, and looking for posts by me (gyrovague).

In essence, in my case I had misconfigured the builtin DHCP server to have the same IP address as the host-only networking adapter itself, hence the two ARP replies. I think the VirtualBox UI and/or VBoxManage CLI should add some sanity checks to prevent clashing IPs and nonsensical netmasks etc. to prevent this kind of issue.