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So, I was working at a very small internet service provider in a rural area in the mid-nineties. For the lack of affordable hardware, we were using Linux machines for routing, and a lot of "unconventional" solutions were necessary due to insufficient hardware being used. Tunelling, and other virtual interfaces of any kind were used often.

I remember one particular case were we running both routed IP and bridged ethernet over a single frame-relay link, and there we had to resort to fixed ethernet-to-ip mapping (turning off ARP) on the bridged link for some reason I really can no longer remember.

> How do you attain the skills required to do this while not also learning not to?

Upvoted for being one of the greatest ways I've ever seen to put what is a VERY common problem. I will quote this mercilessly in the future, if I may. Thanks.

> How do you attain the skills required to do this while not also learning not to

Half-understood StackOverflow answers, natch.

"First hop redundancy" such as HSRP, VRRP and GLBP use similar techniques to load balance and redundancy. This could be a reason for it's use.