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The :for loop documentation is very dense:. Luckily, the old RouterOS 2. This command counts loop variable up or down starting at from and ending with toinclusive, and for each value it executes the do statement. It is possible to change the increment from the default 1 or -1by specifying the step argument.
The first point is that :for loops can count both forward and backward. In the second case, use an extra :if statement or convert it to a :while loop like these examples:. The new documentation does mention the :while loop, but only explains the :do loop:. The old documentation again is better though it lacks examples :.
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And wrong! The new documentation does mention the :while loop, but only explains the :do loop: Command Syntax Description do. The old documentation again is better though it lacks examples : :while — this command has one unnamed argument, a condition. It is evaluated every time before executing do statement. If result is not a boolean value, error is reported. If the result of condition is truecommands are executed once, and the condition is evaluated again, and this repeats until false.
It is similar to the do statement of other commands. If no other arguments are given, :do just executes these commands once. There is not much use in that. If you specify a condition as a value for while argument, it is evaluated after executing commands, and if it returns truedo statement is executed again, and this is repeated until the condition returns false.Loop protect feature can prevent Layer2 loops by sending loop protect protocol packets and shutting down interfaces in case they receive loop protect packets originated from themselves.
The feature works by checking source MAC address of received loop protect packet against MAC addresses of loop protect enabled interfaces.
If the match is found, loop protect disables the interface which received the loop protect packet. Log message warns about this event and interface is marked with a loop protect comment by system.
RouterOS loop protect feature can be used on bridged interfaces as well as on ethernet interfaces which are set for switching in RouterBoard switch chips.
Loop Protect works on ethernet, vlan, eoip and eoipv6 interfaces and its packets are encapsulated with EtherType 0x There is support for adjusting loop protect packet sending interval and interface disable time. Configuration changes or expiration of disable time resets loop protection on interface. Jump to: navigationsearch.
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Fitur Loop Protect Untuk Mengatasi Looping Pada Bridge Di Mikrotik Routeros
With loop protection in place, it means that a user can enter the code as follows on JS Bin, and the final console. The previous implementation used an injected library to handle tracking loops - this version does not. In the above implementation, when code transformed by loop-protect contains an infinite loop, the loop is cleanly exited with a break statement, and any code after the loop is executed normally.
See example. But what if you want to log an error to the console to warn the user, or throw an error instead, to stop execution when an infinite loop is encountered? The protect function takes an optional second argument which can handle both behaviors. To log an error to the console, but continue exectution after the loop, pass protect a string as a second argument. When an infinite loop is encountered, this string will be logged with console.
To throw an error and stop execution, pass protect a simple callback function which throws a new error. Note that if you define the callback with a line parameter, you can use this with a template literal for a more specific error message. For example:. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Latest commit Fetching latest commit…. Example With loop protection in place, it means that a user can enter the code as follows on JS Bin, and the final console. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Long-time MikroTik users have been after better loop prevention mechanisms for quite a while now. Loop protect seems to be designed more as an edge port protocol since it physically disables the port upon detection of a loop, whereas STP will leave the port physically active but logically block traffic on that path.
Some potential use cases for enabling this feature could include:. Below is an example lab we built to test the Loop protect feature.
The idea was to intentionally create a loop between two Cisco switches that would propagate looped frames and broadcasts towards the ethernet port on a MikroTik CRS with Loop Protect enabled. By default, the feature is disabled. This interface will cycle through disabling the interface and the disable timer so long as a loop is present.
MikroTik RouterOS new feature – Loop Protect
The status has now been changed to disabled until the loop clears and the disable timer expires. If you send your log messages to an external syslog server, then you can create alerts to let you know when a port has gone down due to a loop.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. If nothing happens, download GitHub Desktop and try again.
If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. I spent a lot of time in search of information about L2TP protection. I found couple posts which helped me to write first part of that instruction.
The first third of the protection of L2TP is firewall rules. They are monitoring and blocking connections from blacklist and preventing password brutforce. I think that there is no need to explain them, but one thing I have to admit, that you will be forced to change interface name from ether1-WAN to your WAN interface.
I will try to reproduce attackers actions and connect to my L2TP network. You can using various port scanners for searching IP address, but for other items you have to use brutforce. Image yourself that cracker picked up proposal and IPSec Secret.
After I was banned it became impossible to connect to vpn at all. In such situation previous rules can't help, but next records were appearing in Mikrotik's logs. Five strings with: After that I tried to connect to server and an error was appeared. I found such records in Mikrotik log:. So I changed couple strings in initial script and got second one. All these instructions helped me to protect Mikrotik devices, but I noticed that there are is a lot of such records in log:.
And the last steaps you have to do. It's to add these scripts to sheduller, move firewall rules upper in the list and to change mail. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up.
Scripts for L2TP protection. Rascal Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again.
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Under Windows, it is important to protect the main loop of code to avoid recursive spawning of subprocesses when using joblib. In other words, you should be writing code like this:.
Initially, I assumed this was just to prevent against the occasional odd case where a function passed to joblib.
Parallel called the module recursively, which would mean it was generally good practice but often unnecessary. However, it doesn't make sense to me why this would only be a risk on Windows. Additionally, this answer seems to indicate that failure to protect the main loop resulted in the code running several times slower than it otherwise would have for a very simple non-recursive problem. Out of curiosity, I ran the super-simple example of an embarrassingly parallel loop from the joblib docs without protecting the main loop on a windows box.
My terminal was spammed with the following error until I closed it:. My question is, what about the windows implementation of joblib requires the main loop to be protected in every case? Apologies if this is a super basic question. I am new to the world of parallelization, so I might just be missing some basic concepts, but I couldn't find this issue discussed explicitly anywhere. Finally, I want to note that this is purely academic; I understand why it is generally good practice to write one's code in this way, and will continue to do so regardless of joblib.
This is necessary because Windows doesn't have fork. This means that if you have the code that spawns the new process at the module-level, it's going to be recursively executed in all the child processes. Learn more. Why is it important to protect the main loop when using joblib.
Ask Question. Asked 5 years ago. Active 2 years, 2 months ago. Viewed 11k times. The joblib docs contain the following warning: Under Windows, it is important to protect the main loop of code to avoid recursive spawning of subprocesses when using joblib.
In other words, you should be writing code like this: import My terminal was spammed with the following error until I closed it: ImportError: [joblib] Attempting to do parallel computing without protecting your import on a system that does not suppo rt forking. Ple ase see the joblib documentation on Parallel for more information My question is, what about the windows implementation of joblib requires the main loop to be protected in every case?
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Interesting, thanks! I have to say, if I were designing an operating system, I would think the ability to fork processes would be pretty basic and desirable Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.CRS - loop protect, how? As example, if i install pach-cord between ether3 and ether4, switch has died I need connect new user via two 1G channels with many little kids and complicated hardware configand i see the loop as the big danger for my network as not far future.
Russian "crazy" sysadmins, loving much CPU power and throughput in reserve. Re: CRS - loop protect, how? Sat Dec 12, pm You can do this by putting the ports into a bridge, but unfortunately that means the CPU is handling every frame, which will lead to performance that is somewhat less than wirespeed [as CPU has 1G link to switch chip]. Sat Dec 12, pm Hm! I hope you are wrong, and support say how i can enable hardware loop protect in these device. CRS can't be so bad!
Last edited by shodan on Sun Dec 13, am, edited 1 time in total. Code: Select all. Sun Dec 13, am Sorry, i dont understand what i need to do.
Configure Loop Protect in RouterOS (MikroTik)
Please show me you config. AW: CRS - loop protect, how? I've seen a lot managed switch for my 15 years career. But i never seen that epic-fail until now! I see, CRS is a trash! It is horrible! My old HP G do all what i want Sun Dec 13, am My advice is to use Mikrotik routers, and buy switches somewhere else.
Sun Dec 13, am Yes But not CRS Sun Dec 13, pm Sorry, i dont understand what i need to do.