Today we discovered that we'd accidentally done a stupid switch trick tocheat ourselves out of some link bandwidth: we'd accidentally configuredsome untagged ports on one of our top-level switches to also carry sometagged VLANs.

(Normally you configure switch ports in one of two ways: either theycarry one untagged VLAN and nothing else, or they carry some taggedVLANs and no untagged traffic.)

This is effectively invisible, because the regular traffic is stillflowing, and nothing complains about the extra stuff.

We use Ubuntu here , but by now I can'tsay that we're exactly fond of it. At this point we're using it notbecause we like it but because we lack a better alternative, whichgives me a somewhat jaundiced perspective.

A disclaimer: this is about Ubuntu 6.06 (Dapper Drake, the LTS releasethat will be supported for a long time). Moving to more recent Ubuntureleases is not an option for us, because we need longer support periodsthan 1