Dual WAN Fail-over Issue - Tier 1 WAN frequently failing upon activation of the second Tier 2 WAN
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@preston Well there goes that theory. I thought NUT was somehow interfering. Whenever I re-enable the CenturlyLink interface the NUT service stops and I have to restart the service. Other weird behavior that I thought maybe had something to do with it.
Well, hopefully this post gathers attention as others search for this same problem. See what turns up.
If I end up figuring it out will be sure to post here with details.
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A little more information.
I power cycled the Centurylink modem (Zyxel C110Z running Firmware CZW007-4.16.012.15) running in Transparent Bridging Mode. I haven't made any recent changes to the CL modem.
I ENABLED the Centurylink interface on pfSense, left the Centurylink gateway DISABLED, and after 15 minutes the Starlink gateway went down.
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Still working the issue... Is it DHCP???
I noticed that when when the Starlink WAN goes down, many times (not always) the kea-dhcp4 or kea dhcp6 server service stops and will not restart even when clicking the 'play' button on the dashboard.
I see a reference in the DHCP logs that has the dhclient bound to the Centurylink IP (ix2 interface) with a renewal in 900 seconds (15 minutes). 15 minutes is EXACTLY the time it takes for Starlink to go down after enabling the Centurylink interface.
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@preston Interesting. I'll see if I can reproduce this later this evening. I too haven't given up. Just not sure where to go with it next.
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One thing I haven't tried yet is a factory reset and starting all over without restoring from my backup.
I did do a reset and restore from backup, but now I wonder if the restore backup just transferred the bad settings back. A no-op.
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This is exactly what I was about to do when I saw your first reply to my post. Literally I was about to do a fresh install on an old PC I have lying (laying?) around. Had just installed a dual NIC card and was about to start the process of deploying a "fresh" device. No restore from backup. No other packages. Just a clean start, dual wan fail-over setup.
But than I saw your reply. And I thought, "What are the odds that two of us have the exact same problem at roughly the exact same time?" It's very unlikely. Something changed somewhere. Either at CenturyLink's end or StarLink's end. Or elsewhere. But I'm 99% positive it can't be our equipment or the configuration.
I have this other PC ready to go. Maybe I'll give it a shot some night this week just for shits and giggles.
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If you do a traceroute to something outside what is the first address that answers?
I would seriously consider another address to monitor than 8.8.8.8 on that gateway.
I have had issues using that address in the past.
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Thank you for the reply. I have tried a few different monitoring addresses. Doesn't seem to make a difference. And the problem ONLY exists when both interfaces are active. I can have the routing set to only one of the gateways...no fail-over....and it still cycles a down member due to packet loss. As soon as I disable one of the two interfaces everything works fine again.
1 <1 ms <1 ms <1 ms fw1.xxxxxx.localdomain [192.168.1.1] 2 19 ms 20 ms 19 ms 100.64.0.1 3 16 ms 20 ms 23 ms 172.16.252.90 4 19 ms 19 ms 23 ms undefined.hostname.localhost [206.224.65.136] 5 17 ms 27 ms 16 ms undefined.hostname.localhost [206.224.64.173] 6 60 ms 47 ms 20 ms 140.248.126.222 7 17 ms 21 ms 20 ms 151.101.67.5 -
@jimeez said in Dual WAN Fail-over Issue - Tier 1 WAN frequently failing upon activation of the second Tier 2 WAN:
Thank you for the reply. I have tried a few different monitoring addresses. Doesn't seem to make a difference. And the problem ONLY exists when both interfaces are active. I can have the routing set to only one of the gateways...no fail-over....and it still cycles a down member due to packet loss. As soon as I disable one of the two interfaces everything works fine again.
My issue is exactly the same as jimeez. I too have tried different monitoring addresses wiht no change. Simply enabling the Century Link interface causes 100% packet loss after 15 minutes on the Starlink WAN. After a minute or so, the Starlink WAN will return online, but then fail with 100% packet loss every 15 minutes.
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But look at the ultimate latency of both links. One is satellite which by default will have a higher latency.. and the other is DSL which with interleaving will generally have 38ms or so.. (educated guess)
If you do not have the second faster (latency) interface then the system will simply stay on the only gateway is see's.
If (and I have not had the opportunity yet to play with Starlink although at work we will be soon..) your Starlink interface see's a change in latency that is drastic enough then I can see your system trying to switch to a more stable link..
Try this. From a command prompt.. c> Ping -t 8.8.8.8 and let that run for an hour or so. Watch the latency there and see if it changes much. If it does not then I am probably barking up the wrong tree.. But my SWAG says you will probably see some latency swings. Of coarse take your second link down and only allow it on the Starlink.
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Thanks for the reply.
Here are stats from my Starlink for the last 24 hours. The Starlink app statistics also match the pfSense stats.
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I don't want to get my hopes up, but it's been 62 minutes and I have not lost the Starlink WAN. Here is what I did today:
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Deleted the Centurylink Gateway and Centurylink interface.
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Assigned the Centurylink interface and gateway.
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Power cycled the Centurylink modem.
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Disabled the kea-dhcp6 service
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Under System/Routing/Gateways: Changed default IPv6 to NONE.
I haven't added any Gateway groups and failover settings yet, but so far the Starlink WAN is staying up. For now (testing) I have "Block private networks and loopback addresses" and "Block bogon networks" both checked. I also haven't set up a monitor IP or DNS server for Centurylink (one thing at a time).
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.I really think this alone might have done the trick:
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Oh wow. No kidding? That would be amazing if this solved things. If it does, I wonder what that means in terms of why this started happening. Something with CenturyLink perhaps?
Also, general question regarding the IP address of your CenturyLink WAN. I've seen this in a lot of the hot-to videos I watch. Why is the IP address of the CL WAN 192.168.0.1 rather than a CL-assigned IP address?
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That screenshot above is showing the 192.168.0.1 as a monitor IP. I was trying to make as few changes as possible to see what would break it so I did not have a monitor IP or DNS server set.
I have now added a DNS server and monitor address of 8.8.8.8 to the CL connection and it is now showing the CL IP address on the dashboard correctly. After doing so, I had to disable and re-enable the CL interface to get to pull a proper IP.
!!! After adding the DNS server to the CL connection I lost Starlink at the 15 minute mark! D@mn! !!!
Maybe I'm getting closer to the answer since Starlink stayed online for several hours and only went down when I made DNS changes to the CL connection.
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@preston said in Dual WAN Fail-over Issue - Tier 1 WAN frequently failing upon activation of the second Tier 2 WAN:
Thanks for the reply.
Here are stats from my Starlink for the last 24 hours. The Starlink app statistics also match the pfSense stats.
Actually I appreciate you posting those numbers.. It will help me with my day job when we get our setup for a remote site we have.. ;)
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Curious how you're making out over these last 24 hours. Planning to tackle this later this afternoon. Was hoping to see that you've maintained solid connections before embarking on a fresh config. ;-)
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No luck. I thought I had it, but adding the DNS server to the CL connection, it broke the Starlink connection.
How are you running your DNS servers for the dual wan? I am wondering if that is somehow causing Starlink to drop offline.
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@preston said in Dual WAN Fail-over Issue - Tier 1 WAN frequently failing upon activation of the second Tier 2 WAN:
How are you running your DNS servers for the dual wan? I am wondering if that is somehow causing Starlink to drop offline.
I wish I knew how to answer that, but sadly I don't. I followed a guide a year and a half ago and it's been working ever since....until recently. I don't recall doing anything specific directly related to DNS. I do recall though thinking how simple it was to set up.
One question for you: are you running your CL modem in transparent bridge mode?
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I am running the CL modem in transparent bridge mode. My modem is the Zyxel C1100Z.
I am using DNS forwarder. I have tried different combinations of 1.1.1.1 for Starlink and 8.8.8.8 for Centurylink. I have also tried using the DNS servers supplied by Starlink and Centurylink. I may be barking up the wrong tree with the DNS thing, but I'm at my wits end.
I too remember how easy and painless it was to set up the dual wans and like you it ran fine for a long time.
