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Mikrotik L2MTU testing
by Philip Loenneker 26 Apr '17

26 Apr '17

Hi all, I'm sure we all know that you can use ping and do-not-fragment to test the L3 MTU of a path. But can you do anything to test the L2 MTU? We have the L2 MTU on some interfaces set to 1592. L3 MTU is still set to 1500. I want to know that the L2 MTU is working as intended. Doing a MAC ping, which I thought would use L2, is still limiting it to 1500 byte packets before they are unsuccessful due to fragmentation being required. I haven't done a packet capture to test, but it seems like the MAC ping is using L3 packets, which makes sense if it needs to use ICMP so that the destination host responds. I have also tried ARP ping, but that appears to ignore the packet size. I'm hoping to do this all Mikrotik to Mikrotik, but may have to resort to using another device off the side. Any suggestions? Regards, Philip Loenneker | Network Engineer | TasmaNet

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6.39rc8-
by Greg 25 Apr '17

25 Apr '17

This has bitten me on a few upgrade occasions(6.37.x>6.38.x).. There must have been an upset fan-base ? ***************** What's new in 6.39rc80 (2017-Apr-25 09:23): !) bridge - reverted bridge BPDU processing back to pre-v6.38 behaviour; (v6.40 will have another separate VLAN-aware bridge implementation); ********************** Cheers Greg

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Event driven scripts
by Alex Samad 24 Apr '17

24 Apr '17

Hi I know about the vrrp on backup / master events. Are there any ways to capture when an interface comes up. for example if an interface changes state to up I would like to run a script and if it goes off being up then run another scripts Alex

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EoIP
by Jason Hecker (Up & Running Tech) 26 Mar '17

26 Mar '17

Hi Mike I was just looking at your EoIP article https://shop.duxtel.com.au/article_info.php?articles_id=45&osCsid=s28vgpuoi… and was thinking about how it relates to NV2 nowadays. My experience has shown that NV2 seems to support priorities (based on DSCP with a mangle rule) and also I can pass VLAN tagged traffic over it without any issues (I am told this wasn't always the case). With a pure PtP link is it necessary to use your supplied PtP/EoIP scripts or will NV2 do the job just fine now seeings as it seems to pass bridge ethernet frames unmolested? Jason Hecker -- <https://www.upandrunningtech.com.au>

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Sierra Wireless (Telstra Aircard) 320U 4G Modem - SOLUTION
by Paul Julian 24 Mar '17

24 Mar '17

Hi All, we have been using the Sierra Wireless 320U 4G USB modem and a Mikrotik hAP routers for a while now for out of band management on our network, I remember when we first got the modems and plugged them into a routerboard that we had lots of problems getting them working, then there was the mucking about with PPP or LTE etc etc. Anyway we just bought another 20 of them for more of our sites and I faced the same issue again of not being able to get them to work, so when I finally figured out the issue I thought I would share the details here so that it benefited anybody who needed the information. So this device when plugged into a Mikrotik Router USB port will show up as an LTE interface, you shouldn't need to cold boot the device or anything once it's inserted as some people say, the interface should just appear, this is from my experience anyway on 6.35.x version of ROS with a hAP or RB2011 series. If the interface doesn't appear check to make sure you have the "Ignore DirectIP Modem" checkbox NOT ticked under System/Ports/Firmware, you need to have this unticked for it to work. Once you have the interface appearing the only other settings you need to change are to set the APN within the lte1 interface, and add a DHCP client to the Interface to get your IP address from Telstra. If you have organised it when ordering your SIM, telstra.extranet APN will give you a dynamic public IP or telstra.internet APN will give you a dynamic NAT'd private IP, we chose the former so that we could get into the routers remotely, there is no static public IP option in case you were wanting that..... Now, if you have got to this point and are saying that your device is appearing when you plug it in but doesn't get an IP or the lights do funny stuff then read on. These devices have a feature which kicks off the Telstra software installation when you plug it in, unfortunately this feature breaks the process when you plug it into a Mikrotik routerboard, so to disable that feature you need to do the following. Plug the modem into your Windows PC, install the Telstra Mobile Broadband software when it prompts you to. Once it's installed and the device has been discovered and it's ready to connect (Green Connect Now button is visible) go to the Tools menu, then Options, then Account tab, down the bottom you will see a tickbox called "Disable SWOC", tick that box, then click the Apply button, then OK to exit. Unplug the device from your PC and plug it into your Routerboard and then it should work fine. I can't include the image I have for information about the lights on the modem as attachments aren't allowed, but basically you want the power light to be solid BLUE and once it's connected to the network you want the data light to be solid GREEN, this indicates a connection to the LTE network, so faster speeds. I hope this has been useful to somebody J Regards Paul

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Mikrotik PPP Profile and Radius
by Paul Julian 22 Mar '17

22 Mar '17

Hi All, just wondering if anybody has ever had any luck with being able to set the PPP Profile for a radius user by using a Radius reply attribute ? People say it can't be done, there is no attribute listed in the AAA doco but hoping somebody might know of a way we could do it.... Thanks Paul

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NBN Woes
by Ben Jackson - eLogik 22 Mar '17

22 Mar '17

Obviously I have a lot of customers who use Mikrotik devices as their main router. This is causing issues with the NBN's default method of delivering VOIP services as the short-sighted ISP's have all made the laughable assumption that everyone is going to use an ISP-provided CPE to plug their VOIP handset into. As you know these devices will pre-configure the SIP settings. For so many reasons, this of course is not the preferred setup, but it is left to me and others like me to explain why all of a sudden the VOIP service that comes bundled with the ISP's plan will not work with their equipment. I've been told that ISP's will not release the VOIP settings to end-users to facilitate the setup of a stand alone ATA such as the cisco SPA112. I'd just be interested to know how people are dealing with this situation. Cheers, Ben Jackson eLogik m:0404 924745 e: ben(a)elogik.net w: www.elogik.com.au [image: http://www.elogik.com.au] <http://www.elogik.com.au>

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CCR1072
by Alex Samad 21 Mar '17

21 Mar '17

Hi Thought I would share my experience from the last couple of days. I was trying to provision a new 1G service onto one of these. Some reason couldn't get L2 going. So it works out that you have to turn off auto-negotiate and set the speed manually when using a 1G SFP in a 10G SFP+ port on the CCR1072 .. Alex

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VRF & BGP
by Matthew Enger 21 Mar '17

21 Mar '17

Hello, I have two mikrotik routers with the internet public networks in a VRF and bgp running happily until I tried to add a second router which also had its internet network in a VRF. BGP just sits there at connect. If I remove the VRF on one of them, it all of a sudden connects. If the BGP desintation is not inside a VRF (well I assume it is not or the other end is not mikrotik, it works fine). I emailed mikrotik support and apparently there is a known issue with connecting two bgp peers if both ends are inside a vrf. Anyone else seen this and have any work arounds? I am running MPLS on the same router so I would prefer to keep the public internet on its own VRF. Matthew Enger | Managing Director PO Box 3279, The Pines, Victoria, 3109 T 1300 789 299 D 03 9909 3104 M 0406 532 792 F 03 8611 7946 m.enger(a)xi.com.au | www.xi.com.au This email message and any attachments are the property of X Integration. The contents of this email are copyright and may also be confidential and/or legally privileged. They are intended solely for the addressee and it is not intended that either confidentiality or privilege be waived or lost by mistaken delivery to you. Please notify us immediately and delete this communication if received in error. Consider the environment before printing this email.

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SanDisk with CCR
by Alex Samad 20 Mar '17

20 Mar '17

Hi I have a ultra MicroSD card and it doesn't seem to register in my CCR 1072 and 1036s I insert and then go to /disk ... nothing there nothing in the logs either Any suggestions A

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