Now I am experiencing a strange thing…
I have a working PTP link [Dynadish] connected 5 kms apart and was working fine till Monday for past1 year.
Monday the linked dropped connectivity. On probing further I realised that the connection on one end of the network works fine when plugged into a standalone laptop.
But the same connection when plugged into the switch stops responding. There is no IP conflict.
What kind of issue is this?
A dead switch? Maybe after (nearby) lightning strike?
power issues are there on the location but the same switch works comfortably with a standby PTP link provided by a company/product called “BROVIS”
another strange thing is the Mikrotik link is not detected when used in my THINKPAD but it works when plugged into a DELL laptop.
Make sure you’re using the gigabit PoE which came with the dynadish.
Also try another Mikrotik gigabit switch.
I find that using 10/100 PoE’s cause similar issues.
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i am using the Gigabit POE given with the Dynadish.
so i assume the error lies somewhere in the switch or the poe?? am i right???
Most probably… But it could also be a bad crimp.
Remember, on gigabit links all 8 wires are used, on 10/100 only 4 are used.
Sometimes if one of the two blue or browns aren’t crimped properly, you may still have a link, but it does strange things.
If it was me, I’d troubleshoot as follow:
so as told i went ahead and
it seemed to work with on laptop connected to the switch.
today will plug the entire LAN load and see what happens
thanking you for the inputs.
It’s only our pleasure bud!
Please let us know the result.
G
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so the client did not put up the dish in working for so long till the last week.
it worked for a week… and today it has done the same thing.
last time the switch was changed and it worked… but now again the same problem sounds strange!!
the best part is another PTP link on the same switch is working just fine…
hope normis could help in this
ok. exactly after one month of changing the swtich and the link working fine… today the same problems has come back.
when connected to a single laptop on one end of the PTP link… the link works fine but when the same ethernet is plugged into a swtich there is no ethernet communication.
and this is happening just at one end of the PTP link using Dynadish pair.
this is haunting me !!! please help!!!
Have you tried a different brand switch?
Another thing, you should really use a gigabit switch.
You sometimes get switching incompatibilities between devices, especially when connecting gigabit to 10/100.
last time i.e. one month ago i changed the switch from D-Link to Netgear.
it worked on the new Netgear for one month and again yesterday the same issue cropped up.
why is this happening again
Hi,
If your wireless connection is working fine, and the problem is just in one side and when you connect radio to your network switch and the switch port goes down you may have a loop in your network design and if your switch is manageable like MikroTik or Cisco switches you just need to set the BPDU filter or BPDU guard.
Last year i saw one of my customer link goes down, at first i can’t connect to radio on my side an when i connect to my cisco switch 3560 series i notice that the port connected to the radio goes down, so i try to connect to the mikrotik radio and check the wireless link, after a while i understand my customer switch side configured flat i mean they configure they’re cisco 2960 catalyst switch without VLAN configuration and put another radio’s link and network to that switch, and in some reason we are two link between each other in 2 way. Finally i just set the BPDU guard on my cisco switch and the problem solved.
Then tell to the customer to changed they’re design.
Best Regards,
the switch is not managed. it’s a dumb switch.
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will disabling the STP / RSTP on the BRIDGE INTERFACE of the PTP link on a Mikrotik help me with this??
it is just a simple PTP link and nothing more…
link grounding?
the link was working for 2 years in the current setup and suddenly this happened. do you think grounding would do this issue?
This sounds like a spanning tree issue to me – probably, somebody is creating a loop in the network and spanning tree is trying to block it. I would wager that something is connected to the switch that is plugged into itself and causing packets to loop. If the switch doesn’t support spanning tree then the MikroTik would kick in spanning tree and block the entire switch from connecting.
I have seen customers accidentally plug switches into themselves with a long cable where both ends are nearby each other – they see the two ends close by and assume both should be connected to the switch, and connect them, but meanwhile it is actually the same cable, so the customer has just plugged the switch into itself and created a loop. If the switch supports spanning tree, it will block this loop itself, but many unmanaged switches do not.
Unplug everything from that switch except your laptop and the dynadish. See if it works - it should. Plug the rest of the cables back in one at a time and retest so that you can figure out which connection brings everything down, and then you will find the source of the loop. There may be a switch connected directly to your switch that is plugged into itself.
when plugged in a single laptop from the Dynadish the link works perfectly. when plugged back into the switch it starts flapping…
And there is nothing else plugged into the switch besides the dynadish itself when you plug it back into the switch? That wasn’t really clear.