nanog mailing list archives
Re: Stupid Question maybe?
From: Adam Atkinson <ghira () mistral co uk>
Date: Wed, 19 Dec 2018 18:17:27 +0000
On 19/12/2018 16:24, Naslund, Steve wrote:
It has ALWAYS been the only correct way to configure equipment and is a requirement under CIDR. Here were your commonly used netmasks before CIDR/VLSM : 255.0.0.0 255.255.0.0 255.255.255.0 Which one is not contiguous?
There is an example in RFC950 on page 15. 3. A Class C Network Case (illustrating non-contiguous subnet bits) For this case, assume that the requesting host is on class C network 192.1.127.0, has address 192.1.127.19, that there is a gateway at 192.1.127.50, and that on network an 3-bit subnet field is in use (01011000), that is, the address mask is 255.255.255.88. Admittedly, page 6 contains: Since the bits that identify the subnet are specified by a bitmask, they need not be adjacent in the address. However, we recommend that the subnet bits be contiguous and located as the most significant bits of the local address.I have never seen noncontiguous network masks used in real life, but I may not be old enough.
-- Adam Atkinson
Current thread:
- Re: Stupid Question maybe?, (continued)
- Re: Stupid Question maybe? Saku Ytti (Dec 18)
- Re: Stupid Question maybe? Christian Meutes (Dec 20)
- Re: Stupid Question maybe? Saku Ytti (Dec 20)
- Re: Stupid Question maybe? Grant Taylor via NANOG (Dec 20)
- Re: Stupid Question maybe? Saku Ytti (Dec 20)
- Re: Stupid Question maybe? Grant Taylor via NANOG (Dec 20)
- Re: Stupid Question maybe? Saku Ytti (Dec 20)
- RE: Stupid Question maybe? Naslund, Steve (Dec 19)
- Re: Stupid Question maybe? Patrick W. Gilmore (Dec 19)
- RE: Stupid Question maybe? Naslund, Steve (Dec 19)
- Re: Stupid Question maybe? Adam Atkinson (Dec 20)
- Re: Stupid Question maybe? Smoot Carl-Mitchell (Dec 20)
- Re: Stupid Question maybe? valdis . kletnieks (Dec 19)
- Re: Stupid Question maybe? Thomas Bellman (Dec 19)
- Re: Stupid Question maybe? William Herrin (Dec 19)
- Re: Stupid Question maybe? Thomas Bellman (Dec 19)
- Re: Stupid Question maybe? Owen DeLong (Dec 19)
- RE: Stupid Question maybe? David Edelman (Dec 19)
- Re: Stupid Question maybe? Baldur Norddahl (Dec 19)
- Re: Stupid Question maybe? Joe (Dec 19)
- Re: Stupid Question maybe? valdis . kletnieks (Dec 19)