3 ms·
This particular problem would not crop up on Google Compute Engine. See this cryptic snippet from /sbin/ifconfig on a production GCE VM: eth0 Link encap:E
by jsolson 12y ago
This particular problem would not crop up on Google Compute Engine. See this cryptic snippet from /sbin/ifconfig on a production GCE VM:
eth0 Link encap:Ethernet HWaddr 42:01:0a:f0:40:dd
inet addr:10.240.64.221 Bcast:10.240.64.221 Mask:255.255.255.255
This isn't an intentional feature, it's just a property of how our Andromeda SDN[0] is wired up. In particular, we lift the business end of figuring out where the other hosts on your LAN are up into the SDN rather than relying on the guest to cache ARP entries (hence the /32 netmask).
[0]: http://googlecloudplatform.blogspot.com/2014/04/enter-andromeda-zone-google-cloud-platforms-latest-networking-stack.html http://googlecloudplatform.blogspot.com/2014/04/enter-androm...
- jbeda 12y agoActually, this is intentional. Pre-andromeda, we hit ARP caching issues when testing scale for GCE. The model to let the SDN figure out the other end (and stub out things like ARP) was carried forward with Andromeda. (I'm the original TL for GCE)
- jsolson 12y agoOh, interesting. I didn't know it was actually in response to ARP issues. By the time I showed up it was just how bits were wired. Apparently I should've gone to the source :)