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venam
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Dear UNIX diary,

Today I learned, because it's good to be humble, that IPv6 addresses can be built automatically from the mac address (something called EUI-64). I'm wondering if this isn't too much information disclosure though, because the mac address can inform you about the manufacturer.

Another thing I've sort of learned, or more got a revelation about, is that you can run multiple services on the same port on the same machine... they just need to bind to different addresses. What clicked was that these addresses can even be incidentally local/loopback (ex: 127.0.0.1 and 127.0.0.2). I just never realized, even though it's kind of obvious, because we always say "check if something is running on that port", not "check if something is running on the combination of address and port".
This can be really useful when running multiple virtual machines and NATing to external IPs.

EDIT: I'm also getting on learning K8s, it's not bad thus far!

What did you learn today?


Messages In This Thread
UNIX Diary - by z3bra - 18-08-2014, 11:03 AM
RE: UNIX Diary - by venam - 18-08-2014, 11:37 AM
RE: UNIX Diary - by cjm - 18-08-2014, 12:01 PM
RE: UNIX Diary - by venam - 18-08-2014, 12:18 PM
RE: UNIX Diary - by cjm - 18-08-2014, 02:11 PM
RE: UNIX Diary - by venam - 19-08-2014, 12:50 PM
RE: UNIX Diary - by z3bra - 19-08-2014, 01:18 PM
RE: UNIX Diary - by pizzaroll1 - 19-08-2014, 02:15 PM
RE: UNIX Diary - by vompatti - 19-08-2014, 04:20 PM
RE: UNIX Diary - by pizzaroll1 - 19-08-2014, 07:53 PM
RE: UNIX Diary - by venam - 20-08-2014, 12:54 PM
RE: UNIX Diary - by vompatti - 20-08-2014, 06:33 PM
RE: UNIX Diary - by z3bra - 21-08-2014, 04:53 AM
RE: UNIX Diary - by DotDev - 21-08-2014, 07:50 AM
RE: UNIX Diary - by shtols - 21-08-2014, 12:55 PM
RE: UNIX Diary - by venam - 21-08-2014, 01:22 PM
RE: UNIX Diary - by venam - 23-08-2014, 06:55 AM
RE: UNIX Diary - by z3bra - 23-08-2014, 07:27 AM
RE: UNIX Diary - by venam - 24-08-2014, 04:39 AM
RE: UNIX Diary - by xero - 24-08-2014, 11:24 PM
RE: UNIX Diary - by pizzaroll1 - 25-08-2014, 12:37 PM
RE: UNIX Diary - by z3bra - 26-08-2014, 03:38 AM
RE: UNIX Diary - by cjm - 27-08-2014, 12:48 AM
RE: UNIX Diary - by xero - 28-08-2014, 11:11 AM
RE: UNIX Diary - by venam - 30-08-2014, 01:47 AM
RE: UNIX Diary - by kirby - 30-08-2014, 09:56 AM
RE: UNIX Diary - by venam - 30-08-2014, 11:22 AM
RE: UNIX Diary - by venam - 09-09-2014, 12:21 PM
RE: UNIX Diary - by venam - 04-11-2014, 12:27 AM
RE: UNIX Diary - by berk - 10-09-2014, 09:12 AM
RE: UNIX Diary - by xero - 10-09-2014, 10:53 AM
RE: UNIX Diary - by venam - 10-09-2014, 11:51 AM
RE: UNIX Diary - by xero - 11-09-2014, 11:18 AM
RE: UNIX Diary - by z3bra - 12-09-2014, 08:08 AM
RE: UNIX Diary - by xero - 17-09-2014, 10:51 AM
RE: UNIX Diary - by pizzaroll1 - 17-09-2014, 01:07 PM
RE: UNIX Diary - by hades - 17-09-2014, 07:47 PM
RE: UNIX Diary - by venam - 18-09-2014, 12:37 AM
RE: UNIX Diary - by xero - 18-09-2014, 10:51 AM
RE: UNIX Diary - by venam - 18-09-2014, 12:18 PM
RE: UNIX Diary - by earsplit - 19-09-2014, 02:23 PM
RE: UNIX Diary - by vompatti - 20-09-2014, 11:52 AM
RE: UNIX Diary - by pizzaroll1 - 20-09-2014, 08:00 PM
RE: UNIX Diary - by srp - 21-09-2014, 02:09 AM
RE: UNIX Diary - by kirby - 21-09-2014, 03:25 PM
RE: UNIX Diary - by venam - 30-09-2014, 01:00 PM
RE: UNIX Diary - by xero - 08-10-2014, 10:31 AM
RE: UNIX Diary - by cjm - 09-10-2014, 04:14 PM
RE: UNIX Diary - by kirby - 09-10-2014, 08:15 PM
RE: UNIX Diary - by JerrySpringerIsMyDad - 24-10-2014, 10:03 PM
RE: UNIX Diary - by xero - 28-10-2014, 10:38 AM
RE: UNIX Diary - by venam - 28-10-2014, 01:18 PM
RE: UNIX Diary - by neeasade - 09-01-2015, 10:44 AM
RE: UNIX Diary - by z3bra - 09-01-2015, 02:04 PM
RE: UNIX Diary - by z3bra - 19-02-2015, 07:05 AM
RE: UNIX Diary - by venam - 19-02-2015, 04:55 PM
RE: UNIX Diary - by xero - 20-02-2015, 11:49 AM
RE: UNIX Diary - by z3bra - 28-04-2015, 04:13 PM
RE: UNIX Diary - by bsdkeith - 29-04-2015, 05:01 AM
RE: UNIX Diary - by z3bra - 29-04-2015, 10:29 AM
RE: UNIX Diary - by xero - 29-04-2015, 03:09 PM
RE: UNIX Diary - by greduan - 02-05-2015, 09:58 AM
RE: UNIX Diary - by cjm - 07-05-2015, 11:14 AM
RE: UNIX Diary - by z3bra - 07-05-2015, 12:20 PM
RE: UNIX Diary - by neeasade - 24-07-2015, 11:10 PM
RE: UNIX Diary - by z3bra - 25-07-2015, 08:44 AM
RE: UNIX Diary - by Houseoftea - 25-07-2015, 11:32 PM
RE: UNIX Diary - by movq - 26-07-2015, 03:52 AM
RE: UNIX Diary - by z3bra - 27-07-2015, 02:02 PM
RE: UNIX Diary - by z3bra - 24-08-2015, 07:07 PM
RE: UNIX Diary - by xero - 25-08-2015, 10:38 AM
RE: UNIX Diary - by rocx - 30-08-2015, 11:40 PM
RE: UNIX Diary - by z3bra - 31-08-2015, 04:40 AM
RE: UNIX Diary - by venam - 31-08-2015, 07:30 AM
RE: UNIX Diary - by pranomostro - 03-09-2015, 05:34 PM
RE: UNIX Diary - by kirby - 03-09-2015, 06:57 PM
RE: UNIX Diary - by xero - 10-09-2015, 11:30 AM
RE: UNIX Diary - by venam - 14-09-2015, 03:45 AM
RE: UNIX Diary - by darthlukan - 14-09-2015, 02:53 PM
RE: UNIX Diary - by dkeg - 15-09-2015, 07:49 AM
RE: UNIX Diary - by darthlukan - 05-10-2015, 03:03 PM
RE: UNIX Diary - by pranomostro - 05-10-2015, 05:00 PM
RE: UNIX Diary - by apk - 06-10-2015, 02:41 PM
RE: UNIX Diary - by Mafia - 06-10-2015, 09:33 PM
RE: UNIX Diary - by kirby - 12-10-2015, 03:04 PM
RE: UNIX Diary - by pranomostro - 13-10-2015, 08:37 AM
RE: UNIX Diary - by venam - 13-10-2015, 09:38 AM
RE: UNIX Diary - by xero - 13-10-2015, 10:55 AM
RE: UNIX Diary - by pranomostro - 13-10-2015, 11:18 AM
RE: UNIX Diary - by venam - 15-10-2015, 01:34 PM
RE: UNIX Diary - by darthlukan - 15-10-2015, 04:44 PM
RE: UNIX Diary - by pranomostro - 15-10-2015, 06:05 PM
RE: UNIX Diary - by xero - 15-10-2015, 06:58 PM
RE: UNIX Diary - by darthlukan - 16-10-2015, 02:29 AM
RE: UNIX Diary - by pranomostro - 16-10-2015, 10:09 AM
RE: UNIX Diary - by darthlukan - 19-10-2015, 02:10 PM
RE: UNIX Diary - by venam - 20-10-2015, 02:05 AM
RE: UNIX Diary - by darthlukan - 20-10-2015, 02:28 AM
RE: UNIX Diary - by thetornainbow - 20-10-2015, 08:52 AM
RE: UNIX Diary - by Houseoftea - 20-10-2015, 09:11 AM
RE: UNIX Diary - by z3bra - 20-10-2015, 12:18 PM
RE: UNIX Diary - by darthlukan - 21-10-2015, 02:31 AM
RE: UNIX Diary - by z3bra - 30-11-2015, 07:08 PM
RE: UNIX Diary - by apk - 30-11-2015, 08:49 PM
RE: UNIX Diary - by z3bra - 01-12-2015, 08:24 AM
RE: UNIX Diary - by apk - 01-12-2015, 11:43 AM
RE: UNIX Diary - by arcetera - 02-12-2015, 08:57 PM
RE: UNIX Diary - by venam - 03-12-2015, 02:20 AM
RE: UNIX Diary - by pranomostro - 03-12-2015, 11:32 AM
RE: UNIX Diary - by dcat - 07-12-2015, 06:16 PM
RE: UNIX Diary - by venam - 11-12-2015, 07:30 AM
RE: UNIX Diary - by xero - 11-12-2015, 03:04 PM
RE: UNIX Diary - by pranomostro - 13-12-2015, 08:31 AM
RE: UNIX Diary - by venam - 13-12-2015, 03:22 PM
RE: UNIX Diary - by strang3quark - 13-12-2015, 03:57 PM
RE: UNIX Diary - by rocx - 13-12-2015, 04:37 PM
RE: UNIX Diary - by Wildefyr - 13-12-2015, 07:29 PM
RE: UNIX Diary - by venam - 14-12-2015, 01:37 AM
RE: UNIX Diary - by movq - 14-12-2015, 12:44 PM
RE: UNIX Diary - by venam - 14-12-2015, 12:56 PM
RE: UNIX Diary - by pranomostro - 14-12-2015, 01:24 PM
RE: UNIX Diary - by movq - 19-12-2015, 03:26 PM
RE: UNIX Diary - by venam - 20-12-2015, 05:02 AM
RE: UNIX Diary - by movq - 20-12-2015, 08:13 AM
RE: UNIX Diary - by pranomostro - 20-12-2015, 10:21 AM
RE: UNIX Diary - by z3bra - 20-12-2015, 03:46 PM
RE: UNIX Diary - by movq - 22-12-2015, 03:27 PM
RE: UNIX Diary - by XcelQ - 24-01-2016, 01:32 PM
RE: UNIX Diary - by pranomostro - 26-01-2016, 02:17 PM
RE: UNIX Diary - by XcelQ - 28-01-2016, 03:17 AM
RE: UNIX Diary - by rain1 - 19-04-2016, 08:28 AM
RE: UNIX Diary - by josuah - 22-04-2016, 05:45 PM
RE: UNIX Diary - by movq - 07-05-2016, 01:34 PM
RE: UNIX Diary - by rocx - 16-05-2016, 02:21 AM
RE: UNIX Diary - by venam - 10-06-2016, 01:11 AM
RE: UNIX Diary - by venam - 14-09-2016, 01:12 AM
RE: UNIX Diary - by xero - 14-09-2016, 11:36 AM
RE: UNIX Diary - by jkl - 14-09-2016, 11:58 AM
RE: UNIX Diary - by venam - 31-01-2017, 09:27 AM
RE: UNIX Diary - by rocx - 18-02-2017, 02:17 AM
RE: UNIX Diary - by fre d die - 15-03-2017, 06:13 PM
RE: UNIX Diary - by rocx - 15-03-2017, 07:07 PM
RE: UNIX Diary - by robotchaos - 07-04-2017, 02:13 AM
RE: UNIX Diary - by evbo - 08-04-2017, 03:00 AM
RE: UNIX Diary - by jkl - 08-04-2017, 08:30 AM
RE: UNIX Diary - by venam - 09-04-2017, 04:56 AM
RE: UNIX Diary - by robotchaos - 10-04-2017, 03:56 PM
RE: UNIX Diary - by jkl - 10-04-2017, 04:03 PM
RE: UNIX Diary - by robotchaos - 10-04-2017, 04:22 PM
RE: UNIX Diary - by jkl - 10-04-2017, 04:25 PM
RE: UNIX Diary - by josuah - 11-04-2017, 09:19 AM
RE: UNIX Diary - by jkl - 11-04-2017, 09:39 AM
RE: UNIX Diary - by evbo - 18-04-2017, 02:20 PM
RE: UNIX Diary - by robotchaos - 18-04-2017, 03:43 PM
RE: UNIX Diary - by nas - 12-06-2017, 09:33 AM
RE: UNIX Diary - by Tmplt - 12-07-2017, 02:00 AM
RE: UNIX Diary - by xero - 13-07-2017, 03:12 PM
RE: UNIX Diary - by venam - 20-10-2017, 03:12 AM
RE: UNIX Diary - by Houseoftea - 04-01-2018, 08:40 PM
RE: UNIX Diary - by rocx - 05-01-2018, 02:04 AM
RE: UNIX Diary - by Tmplt - 21-01-2018, 10:02 PM
RE: UNIX Diary - by jkl - 22-01-2018, 08:14 AM
RE: UNIX Diary - by Tmplt - 22-01-2018, 01:02 PM
RE: UNIX Diary - by mrtn - 22-01-2018, 04:47 PM
RE: UNIX Diary - by jkl - 22-01-2018, 04:53 PM
RE: UNIX Diary - by jkl - 31-03-2018, 09:22 PM
RE: UNIX Diary - by jkl - 15-05-2018, 12:17 PM
RE: UNIX Diary - by z3bra - 20-09-2018, 07:07 PM
RE: UNIX Diary - by xero - 25-10-2018, 01:27 PM
RE: UNIX Diary - by venam - 26-10-2018, 01:08 AM
RE: UNIX Diary - by Steph - 28-10-2018, 05:23 PM
RE: UNIX Diary - by rocx - 04-11-2018, 01:48 PM
RE: UNIX Diary - by jkl - 05-11-2018, 10:18 AM
RE: UNIX Diary - by pranomostro - 06-11-2018, 09:06 AM
RE: UNIX Diary - by anthk - 10-01-2019, 12:20 PM
RE: UNIX Diary - by pranomostro - 10-01-2019, 04:38 PM
RE: UNIX Diary - by gaak - 14-01-2019, 09:47 PM
RE: UNIX Diary - by josuah - 10-12-2019, 08:39 PM
RE: UNIX Diary - by z3bra - 15-05-2020, 12:19 PM
RE: UNIX Diary - by wolf - 18-06-2020, 04:52 PM
RE: UNIX Diary - by fre d die - 08-07-2020, 04:47 PM
RE: UNIX Diary - by seninha - 08-07-2020, 09:34 PM
RE: UNIX Diary - by movq - 28-09-2020, 03:19 PM
RE: UNIX Diary - by z3bra - 29-09-2020, 11:00 AM
RE: UNIX Diary - by jkl - 30-09-2020, 03:52 AM
RE: UNIX Diary - by movq - 28-05-2021, 03:18 PM
RE: UNIX Diary - by movq - 27-09-2021, 11:56 AM
RE: UNIX Diary - by venam - 17-12-2021, 03:49 PM
RE: UNIX Diary - by z3bra - 20-12-2021, 08:34 AM