RE: IP addresses on subnet edge (/24)

2020-09-15 Thread Brian Turnbow via NANOG
> On 9/14/20 2:25 PM, Andrey Khomyakov wrote: > > TL;DR I suspect there are middle boxes that don't like IPs ending in > > .255. Anyone seen that? > > Yes. We'd every so often get random complaints that "my friend can't reach > my website but I can", etc., with not enough detail to track it down.

RE: IP addresses on subnet edge (/24)

2020-09-15 Thread Joe Klein
You could have them try the AWS E2 reachability site to confirm if this is the case. https://ec2-reachability.amazonaws.com/ Many of their test nodes end with .255 or .0. There are a few ending with 255.255 and several that end with 0.0. I’m not sure what the website test actually does (ICMP v

Re: IP addresses on subnet edge (/24)

2020-09-15 Thread Jeremy Visser
On Tue, Sep 15, 2020 at 8:26 AM Töma Gavrichenkov wrote: > Also .0 and .1. > > Yes, there was some kind of a strange behavior with those addresses > before. We excluded those from rotation back in 2011 when that was really > biting us. There's an impression that this issue has become much less

Re: IP addresses on subnet edge (/24)

2020-09-14 Thread Robert L Mathews
On 9/14/20 2:25 PM, Andrey Khomyakov wrote: > TL;DR I suspect there are middle boxes that don't like IPs ending in > .255. Anyone seen that? Yes. We'd every so often get random complaints that "my friend can't reach my website but I can", etc., with not enough detail to track it down. The problem

Re: IP addresses on subnet edge (/24)

2020-09-14 Thread Mark Andrews
You may want to do traceroute using syn/ack packets to find the offending piece of equipment (may require modifying traceroute to set the syn and ack). > On 15 Sep 2020, at 07:25, Andrey Khomyakov wrote: > > TL;DR I suspect there are middle boxes that don't like IPs ending in .255. > Anyone se

Re: IP addresses on subnet edge (/24)

2020-09-14 Thread Töma Gavrichenkov
Peacez On Tue, Sep 15, 2020, 12:26 AM Andrey Khomyakov wrote: > TL;DR I suspect there are middle boxes that don't like IPs ending in .255. > Anyone seen that? > Also .0 and .1. Yes, there was some kind of a strange behavior with those addresses before. We excluded those from rotation back in

Re: IP addresses on subnet edge (/24)

2020-09-14 Thread Tom Hill
On 14/09/2020 22:25, Andrey Khomyakov wrote: > TL;DR I suspect there are middle boxes that don't like IPs ending in > .255. Anyone seen that? Yes, but not for many, MANY years. I would expect that this service might not like addresses ending in .0 either? It was ca. 2010, when I started receiving

Re: IP addresses on subnet edge (/24)

2020-09-14 Thread Warren Kumari
On Mon, Sep 14, 2020 at 5:28 PM Andrey Khomyakov wrote: > > TL;DR I suspect there are middle boxes that don't like IPs ending in .255. > Anyone seen that? Windows XP/Windows 2003 both had an issue where addresses ending in .255 wouldn't work, regardless of the mask. It seems unlikely that there