Superior ping
Superior ping
For those who want to try it at home:
ping 33333333
ping 55555555
I am sorry, two random Internet users in Korea and Germany, your IP addresses are simply special.
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Best ping is 127.0.0.1
It always resolves!
Try pinging 127.1 - it is the same, but shorter.
Just another tipp from someone who learned TCP/IP from reading the sources over three decades ago...
even shorter:
ping 0This is a special case. This resolves to 0.0.0.0, and technically cannot be routed. Some(!) systems use it as a kind of alias for all local network addresses, but it is not a given.
I'm aware. Conveniently this works on all the systems I've tried, making it useful for testing local services (e.g.
ssh 0).
That resolves to 0.0.0.0 - rarely useful
But it’s shorter!
But it does not work by definition, it is non-routable. That some systems use it as an alias is a different issue.
Can you explain how/why its the same?
My instinct says its actually trying to reach 127.1.0.0 (which is still local host), but that's an educated guess at best.
Fun fact 127.0.0.1-127.255.255.254 is all localhost
Pretty insane that around 0.4% of all IPv4 addresses are wasted.
Wayyyyyy more than that is wasted.
Apple (and others) used to have an A class. I think they gave some of it back to the pool.
public universities have entered the chat
A few years ago my old university finally went with NAT instead of handing out public IPs to all servers, workstations and random wifi clients. (Yes, you got a public IP on the wifi. Behind a firewall, but still public.) I think they have a /16 and a few extra /24s in total.
Honestly there isn't much reason to go with NAT unless you are looking to lease/sell IPs
The sad part is that almost no universities do IPv6
I kinda get why organisations don’t migrate.
IPv6 just hands you a bag of footguns. Yes, I want all my machines to have random unpredictable IPs. Having some extra additional link local garbage can’t hurt either, can it? Oh, and you can’t run exhaustive scans over your IP ranges to map out your infra.
I’m not saying people shouldn’t migrate, but large orgs like universities have challenges to solve, without any obvious upside to the cost. All of the above can be solved, but at a cost.