Seemingly random ethernet link drops, usually at DHCP lease T1
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@Andy142 said in Seemingly random ethernet link drops, usually at DHCP lease T1:
Since adding a dumb switch in between the ISP box and pfSense I haven't had any link drops.
Which means it was the ISP box pulling it's LAN port, the one connected to the pfSense WAN, down.
Power issue ?
Is this a modem type device, for example cable modems tend to do this to signal a 'bad uplink'.
If its a router type, I would consider that behavior as 'not normal'.Like a clock : every 30 minutes sharp you the connection drops packets (== the monitor pings ), to re establish 10 a 20 seconds later.
Welll... what to say ? "Not all ISPs are equal ^^" ?! -
@Gertjan I'm not sure if it's power related.... I have a security camera setup on the switch, pfSense NIC and ISP box. Before adding the switch int he middle the link lights would go out at the same time as the lag spike. Now with the switch in the middle the link lights for both stay active on all 3 devices. I even changed it out to a smart switch to see if that replicated the issue but the lights stayed active.
I've sent an email to the ISP with the logs for them to investigate.
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ISP asked me to take some logs using pingPlotter. You can see a significant lag spike at hop 2.
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Something missing : your avaible bandwidth.
After all, what happens with ICMP packets when the upstream or downstream "pipe" is full ? They get discard. And that shows up as a rising latency, or even packet loss, and it looks like the connection went 'bad'.
But its none of all this : it just queuing = delays. -
@Gertjan Is there a way I can get this? I wasn't using any internet at the time.
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@Andy142 said in Seemingly random ethernet link drops, usually at DHCP lease T1:
I wasn't using any internet at the time
Like you as a person ? Maybe.
And your devices ? When a PC decides to upgrade to the last 2H24, or your phone has the newest OS version avaible, it won't ask you for permission, it just starts downloading.pfSense can show you what happened when :
If no traffic goes ever the WAN at the moment latency started to rise, then ... well, be ready to "never have the answer".
As ISPs normally do not reserve your 1 Gbit symmetrical (if that's what you have) just for you.
They will rent out the same bandwidth to many of their clients and then they hope you guys won't use their bandwidth all at the same time, because if that happens, while you doing nothing, cellmate will spike.
An ISP normally never admits that this happens ^^
Read the contract : somewhere you'll find written : 'connection speed is best effort'. -
@Gertjan Unfortunately no gigabit symmetric connection here. I'm lucky to get 120/8. I'll put a isolated fresh VM with updates disabled overnight to see what happens. Given the every 30 minutes nature of the problem I can't see this being a bandwidth issue.
Will see what the ISP comes back with, I have some good data so far.
Still interested to see why the ethernet link drops. I disabled gateway monitoring actions and tried again without the switch, still issues.
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@Andy142 said in Seemingly random ethernet link drops, usually at DHCP lease T1:
Still interested to see why the ethernet link drops. I disabled gateway monitoring actions and tried again without the switch, still issues.
Test with the switch in the "WAN line" and "monitoring action" disabled.
If then still issues, stop looking : it's the ISP device or ISP connection. -
@Gertjan said in Seemingly random ethernet link drops, usually at DHCP lease T1:
n the "WAN line" and "monitoring
With or without monitoring actions enabled it's stable when the switch is in the middle.
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Pretty solid proof then that the ISP device, connected to the pfSense WAN port took down the interface.
Afaik : reasons can be : if its a modem type device : they do this to signal down stream a data carrier loss.
Bad power.
Bad NIC.Most often, these ISP devices have also a GUI. It's time to have a look at, maybe there are details about the loss available.
