why not use 192.0.2.0/24 addrs? lots of other ranges you could probably use safely. https://en.wikipedia.org/wiki/Reserved_IP_addresses Using .0 you're asking to exercise bugs and undefined implimentation choices of various tcp stacks and resolvers out there on myriad devices. Clever collision avoidance, but relies on a prayer. (IIRC try setting an NS record to resolve to 127.0.0.255 on windows 95 - it used to lock the OS up.... fun times. Someone had pointed some popular domain at us by accident, and having no entry and no negative caching of the day meant we were being hammerred on our 10mbps uplink, had to set something to get cached, so we did... several hours later a microsoft engineer called us and pleaded with us to use a different IP. :) /kc On Fri, Dec 08, 2017 at 05:25:58PM -0500, William Herrin said:
On Fri, Dec 8, 2017 at 4:50 PM, Ryan Hamel <Ryan.Hamel@quadranet.com> wrote:
I'm not implying HTTP, I'm implying a static route at each sites private
layer 3 router (it'll move to BGP in the future). The repository server listens on the IP as well.
My original question was the fact of using 172.16.0.0/32 as a usable IP
address (not even caring about anycast).
Internal private network that is reachable by clients.
Hi Ryan,
Clients meaning employee computers or clients meaning other networks who subscribe to your service and connect with a VPN?
The the former, save yourself grief and use a different /32.
For the latter, it's semi-clever. It neatly avoids the problem of customers using the same RFC1918 addresses as you. Even if they're using a subnet like 172.16.0.0/24, a /32 route can usually override that one address without ill effect.
It's only semi-clever because the .0 address is a corner case in the code and corner cases are where bugs are most likely to happen. And if you're sending clients from that address to another host with a regular 172.16 address anyway...
Regards, Bill Herrin
-------- Original message -------- From: William Herrin <bill@herrin.us> Date: 12/8/17 1:45 PM (GMT-08:00) To: Ryan Hamel <Ryan.Hamel@quadranet.com> Cc: nanog@nanog.org Subject: Re: Static Routing 172.16.0.0/32
On Fri, Dec 8, 2017 at 4:37 PM, Ryan Hamel <Ryan.Hamel@quadranet.com> wrote:
1. A single known ip address that redirects to the closest internal repo server. 172.16.0.0/32 redirects to a usable subnet ip in 172.16.xx.xx by static route.
Hi Ryan,
Maybe if would help if you write the extended version because that's about as clear as mud. First you asked about routing. Now you imply HTTP.
Regards, Bill Herrin
-- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: <http://www.dirtside.com/>
-- William Herrin ................ herrin@dirtside.com bill@herrin.us Dirtside Systems ......... Web: <http://www.dirtside.com/>
-- Ken Chase - math@sizone.org Guelph Canada