On Dec 5, 2007, at 3:54 PM, Templin, Fred L wrote:
The domain of applicability for this would be for any DHCP usage and not just the DHCP-AUTH stuff. But, I would also like to use it as a template for future documents that add similar support for other UDP applications. Any comments on it would be welcome.
The fact that you say it this way actually illustrates the main problem with it. There's already a way to do fragmentation of UDP packets. It's done at the IP layer, so there's no need to do it on a per-UDP-protocol basis.
A relay agent that doesn't handle a full 1500-byte DHCP packet is broken - DHCP has been specified to allow this for a really long time now. My comment in the WG is simply that nobody really ever uses this, so we can't be sure that it works on every device. But it should. So I would much rather get it working than come up with a workaround.
E.g. you could come up with a hack to TCP to make it work for routers that can't handle packets larger than 576 bytes, despite the fact that the physical layers between which they are routing support 1500-byte packets. But you wouldn't do that. You'd send back the router, and demand a refund.
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