Conversation
andy

Andy Newton

HUH!? Since when does the gateway of a network not allowed to be the first address of the network. I have been racking my brain on why an #openwrt config wasn't working only to find that things like iphones, ipads, smart tvs don't like the net gateway to be the first address (e.g. 172.16.0.0). Naturally, Linux has no problem with this.
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chrysn@chaos.social

chrysn

Reply to @andy

@andy IIRC from my CCNA days, on v4 the first address is always the network address and thus reserved, and not to be used by any host (just as is the last, the broadcast address). Any /n only has 2^(24-n)-2 usable addresses.
Or have those been unreserved and I missed the memo?

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andy

Andy Newton

Reply to @chrysn@chaos.social
@chrysn

You'd think I would know this. RFC 1122 says it is a no-no because some non-standard devices wrongly use it as the broadcast address.
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