VirtualBox

Opened 9 years ago

Closed 9 years ago

Last modified 9 years ago

#14894 closed defect (worksforme)

Constant ARP requests — at Version 1

Reported by: Horizon_Brave Owned by:
Component: network/NAT Version: VirtualBox 5.0.10
Keywords: ARP, OUI, MAC, Cc:
Guest type: Linux Host type: Windows

Description (last modified by Valery Ushakov)

Hello

I'm using a Debian distro in Windows 10, through Virtualbox. I have a NAT network, as I just need some basic functionality for now. This really isn't a problem, but more of a curiosity. I'm running a background tcpdump and I notice anytime Debian needs to make a request 'outside" (sent to 10.0.2.2 my default virtual router), I see that an ARP request for the MAC of 10.0.2.2 has to be sent. Even a ping, a traceroute, any NTP requests, etc... they all force debian to ARP out a request for the MAC. Here's a sample:

15:44:27.964752 ARP, Request who-has 10.0.2.2 tell 10.0.2.15, length 28
15:44:27.965098 ARP, Reply 10.0.2.2 is-at 52:54:00:12:35:02 (oui Unknown), length 46

This plays out each and every time Debby, needs to contact something through it's default gw. Is this expected? I checked my arp cache and it has the entry for the 10.0.2.2 gateway with it's matching MAC address.

The OUI unknown message is what's bothering me that there may be an issue with it trying to use the entry into the arp table? Any idea's?

Change History (1)

comment:1 by Valery Ushakov, 9 years ago

Description: modified (diff)
Resolution: worksforme
Status: newclosed

This is your guest doing normal ARP lookups, nothing VirtualBox related here.

The OUI unknown message just means that tcpdump doesn't have an entry for 52:54:00 prefix in its OUI database. It doesn't affect anything at the network level.

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