The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Power User’ Category

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Mac OS X – need to research this one day: How do I Check DHCP Lease info in terminal – via Ars Technica OpenForum

Posted by jpluimers on 2017/06/20

One day I need to research how to get the conversions right for this: How do I Check DHCP Lease info in terminal – Ars Technica OpenForum as I think that ipconfig getoption en0 lease_time gives me the value in a different format than date -r expects.

Also:

At T1 seconds (typically set to 0.5*lease_time) after the last successful renewal, the DHCP client attempts to renew it’s lease with the DHCP server that granted it’s current address via unicast. If unsuccessful, at T2 seconds (typically set to 0.875*lease_time) after the last renewal, the DHCP client attempts to rebind with any DHCP server via multicast.

–jeroen

Posted in Apple, bash, Development, Mac, Mac OS X / OS X / MacOS, OS X 10.10 Yosemite, OS X 10.11 El Capitan, OS X 10.9 Mavericks, Power User, Scripting, Software Development | Leave a Comment »

MikroTik SFP module compatibility table – MikroTik Wiki

Posted by jpluimers on 2017/06/19

Paraphrased from MikroTik SFP module compatibility table – MikroTik Wiki [WayBack]:

SFP+ interface compatibility settings with 1G links

For MikroTik devices with SFP+ interface that support both 10G and 1G link rate following settings are needed to be set on both linked devices for required interfaces. In order to get them working in 1G link rate.

  • auto-negotiation disabled
  • port speed 1G
  • FD

Devices which SFP+ ports support 1G links:

Devices which SFP+ interfaces can be used only for 10G links:

Some caveats leading to the above info: CCR1036-8G-2S+ SFP Problems – MikroTik RouterOS [WayBack]

–jeroen

Posted in Internet, MikroTik, Power User, routers | Leave a Comment »

keyboard shortcut to edit cell content? | Apple Support Communities

Posted by jpluimers on 2017/06/19

When you’ve got an Excel on Windows back-ground, sometimes simple stuff is difficult. So:

option+return edits a cell’s content.

Source: keyboard shortcut to edit cell content? | Apple Support Communities

–jeroen

Posted in Apple, Keyboards and Keyboard Shortcuts, Mac OS X / OS X / MacOS, OS X 10.10 Yosemite, OS X 10.11 El Capitan, Power User | Leave a Comment »

URLs for Mikrotik PCC load balancing

Posted by jpluimers on 2017/06/16

PCC load balancing saved my ass; here are some link I used:

–jeroen

Posted in Development, Internet, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

OpenSSH Escape Sequences (aka Kill Dead SSH Sessions) – The Lone Sysadmin

Posted by jpluimers on 2017/06/16

You can get the below help when pressing these keys in an OpensSSH session:

  1. Enter
  2. ~
  3. ?

So thats Enter, followed by tilde, then question mark.

Then you get this help:

Supported escape sequences:
 ~.   - terminate connection (and any multiplexed sessions)
 ~B   - send a BREAK to the remote system
 ~C   - open a command line
 ~R   - request rekey
 ~V/v - decrease/increase verbosity (LogLevel)
 ~^Z  - suspend ssh
 ~#   - list forwarded connections
 ~&   - background ssh (when waiting for connections to terminate)
 ~?   - this message
 ~~   - send the escape character by typing it twice
(Note that escapes are only recognized immediately after newline.)

The one I use most is below; it leaves my tmux session alone.

  1. Enter
  2. ~
  3. .

–jeroen

via: SSH Escape Sequences (aka Kill Dead SSH Sessions) – The Lone Sysadmin

Posted in Power User, Security | Leave a Comment »

IPv6 on Mikrotik URLs

Posted by jpluimers on 2017/06/15

I need to really put some effort in this:

–jeroen

Posted in Internet, MikroTik, Power User, routers | Leave a Comment »

Mikrotik firewall URLs

Posted by jpluimers on 2017/06/14

Some links that inspired me for various Mikrotik firewall rules:

–jeroen

Posted in Development, Internet, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

Bug fixes from both sides for “Windows 10 Creators update and Delphi debugging don’t go well”

Posted by jpluimers on 2017/06/13

It looks like Microsoft and Embarcadero solved their ends for [WayBack] Windows 10 Creators update and Delphi debugging don’t go well… :

The issue was caused by the Windows LoadLibrary trying to optimise loading which backfired for libraries (PE files like DLL/EXE…) that have multiple import tables in them as generated by the Delphi and C++ Builder linker (and maybe other linkers as well).

Microsoft finetuned their optimisation whereas a future update to Delphi and C++ Builder will generate more optimised import tables.

–jeroen

via [WayBack] Blog post “The Issue with Delphi Runtime Packages and Windows 10 Creators Update”… – Marco Cantù – Google+

 

Posted in Delphi, Development, Power User, Software Development, Windows, Windows 10 | Leave a Comment »

URLs for Mikrotik scripts to block IP addresses after repetitive login failures

Posted by jpluimers on 2017/06/13

For my research list:

–jeroen

Posted in Development, Internet, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

Reverse ssh tunnel between two linux boxes to allow RDP traffic over port 3389

Posted by jpluimers on 2017/06/12

You know the drill: site that limits incoming traffic and has painful VPN. Luckily this time outgoing ssh traffic on port 22 was allowed (because they do SFTP which is SSH File Transfer).

Since I’ve outside Linux boxes and could run a Linux VM there (all Tumbleweed based), this allowed me to do a reverse SSH tunnel. Those are always a bit confusing, but this set of drawings really helps: What’s ssh port forwarding and what’s the difference between ssh local and remote port forwarding – Unix & Linux Stack Exchange [WayBack].

Which brings me to a statement like this:

ssh -o "ExitOnForwardFailure yes" -R :3389:192.168.199.114:3389 -p 33322 93.184.216.34

That didn’t work: a remote machine could not RDP to port 3389, but a local telnet localhost 3389 would. The reason is that by default sshd binds a remote port to the local address only and not the wildcard addres.

So you have to open up the remote config a bit: at least /etc/sshd_config and most likely also your firewall.

Read the rest of this entry »

Posted in *nix, Communications Development, Development, Internet protocol suite, Linux, openSuSE, Power User, SSH, SuSE Linux, TCP, Tumbleweed | Leave a Comment »

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