Very brief network outages

[triumph100]

My router is posting the below pair of entries in the WAN DHCP Log on the hour's 13th and 17th minutes, every hour 24x7.  I receive a very brief network outage during the first entry (on the 13th minute) for about 5 seconds.

Time | Event type | Log Level | Details

2022 Apr 25 22:17:38

dhclient

info

[WDHCP] RCV: Reply message on eth4 from XXXX::XXXX:XXXX:XXXX:XXXX.

2022 Apr 25 22:13:35

dhcpc.sh

info

[WAN.6][WDHCP] renew IP: XX.XX.XX.XX

Any thoughts?

Also, where does the "PON Card" you indicated sit?  Is that within the ONT, or? 

Thank you!!

[Cang_Household]

Unless your WAN DHCP log shows IP rebind warnings and arp failures, it is not likely an upstream issue.

PON card is sitting in the Central Office/Neighborhood distribution hub. More specifically, in the Optical Line Terminal, the other end of the fiber reaching your ONT.

It could be a clock synchronization issue, that the Gateway Router (GWR) recycles your WAN IP before your router times out to renew the IP address.

[triumph100]

This post was originally in response to this solved one: 

"HELP - Daily WAN disconnects" 

https://forums.verizon.com/t5/fios-internet/help-daily-wan-disconnects/m-p/912409#M85885

I believe it may be very similar!

[Cang_Household]

That's not similar.

Like I said before, unless your WAN DHCP log shows IP rebind warning or arp failures, it is not likely a upstream issue.

[triumph100]

Thanks for the replies.  I checked the WAN DHCP Log and no indication of IP rebind warning or arp failures.

Now that I've been investigating this a little more in depth, the drop outs are much more frequent and random throughout the day.  The internet drops out for only about 5 seconds each time.  I've checked that our Verizon TV and Land-line Phone (there's a dial tone) are both running seemingly fine during a drop out.

I'm not seeing any other useful information in any of the logs on the Fios Router.

Not sure what else to check and of course open to any ideas.

[triumph100]

Here is a sample of the outage frequency and duration.  I ran this log overnight.

[Cang_Household]

I believe this may be a LAN DHCP issue. Could you turn off G3100's DHCP server and run another separate DHCP server in your network?

[triumph100]

I believe that is a little over my head.  Do you have any articles that could help?  Wasn't able to find anything on the web.

[dslr595148]

---

@triumph100 wrote:

I believe that is a little over my head.  Do you have any articles that could help?  Wasn't able to find anything on the web.

Not known what you need help with.

If you need to turn off the DHCP Server, that will depend on the brand and model of the NAT router. If your NAT router is the G110 (OR your NAT router has the same UI that the G100 has.  See as need be REF https://forums.verizon.com/t5/g1100-bridging-guide/bd-p/g1100-bridging-guide to show what the UI looks llke) then...

---

#1 After logging into it click on "My Network" tab in the main navigation bar. 

#2 Click "Network Connections" tab in the left submenu.

#3 Click "Network (Home/Office)" hyperlink in the Network Connections section.

#4 Click "Settings" at the bottom of Network (Home/Office) Properties.

#5 There is need to change the LAN IP of the NAT router, as directed in the G1100 Bridging Guide.

#6 Under IP Address Distribution section, change the dropdown "IP Address Distribution" to "Disabled." 

#7 Save/Apply the setting.

On the other hand If your NAT router is not the G1100 (or simular UI), then it would help to post at least the brand and model of your NAT router.

---

If you need help setting up a DHCP Server, it would help to know...

#1 What the OS and Version that your computer uses. As depending on the OS there might be one there but this feature is disabled.

#2 If you have any other NAT routers besides the G1100 (or other NAT router with a simular UI.)

Anyways moving along...

#1 The reason why the DHCP Server in the NAT must be disabled is because you can have only DHCP Server enabled at a time, otherwise conflicts will happen.

#2 I used Google to lookup dhcp server freeware

I found different results back.

https://sourceforge.net/projects/dhcpserver/

https://www.snapfiles.com/get/serva.html Note includes a DHCP Server but not just a DHCP Server.

https://www.hanewin.net/dhcp-e.htm

https://www.dhcpserver.de/cms/

[EDIT] I also found this https://en.wikipedia.org/wiki/Comparison_of_DHCP_server_software

[triumph100]

My Router is the Verizon G3100

[triumph100]

We have multiple devices on the network, primarily Windows 10, but do have a few macOS and mobile devices on Android and iOS.

[triumph100]

Behind the G3100 Fios Router, I have the following Switch:

Araknis Networks® 110 Series Unmanaged+ 16 Port Gigabit Switch

The switch does perform DHCP, and it was set to enabled.  I've just disabled it to see if anything changes for the better, assuming the G3100 was already doing all the DHCP duties I'm not sure if they would conflict with eachother?

Separately, would it be possible for the G3100 to handoff DHCP duties to the switch entirely, even for wireless connections? 

[triumph100]

I've disabled DHCP on the switch, and it hasn't made any difference.

[triumph100]

I believe I may have stumbled onto a solution.  Setting all my ethernet connected computers to Static IPs within the G3100 has seemingly solved it.  I've also left my G3100 as the DHCP provider, and disabled DHCP on my switch.

[triumph100]

Since making the change, I've had a drop after 1.5hrs, then another after only 15 minutes.  Still monitoring, but still something is not quite right.

[triumph100]

OK, after setting all connections to static IPs, disconnects are only happening a couple times an hour now.

I've isolated disconnects to these info messages in the LAN DHCP Log:

2022 Apr 29 23:26:15

dhcpd

info

[LDHCP][IPv6] Sending Reply to XXXX::XXXX:XXXX:XXXX:XXXX port 546

2022 Apr 29 23:26:15

dhcpd

info

[LDHCP][IPv6] Information-request message from XXXX::XXXX:XXXX:XXXX:XXXX port 546, transaction ID 0x9034AB00

[Cang_Household]

---

@triumph100 wrote:

Araknis Networks® 110 Series Unmanaged+ 16 Port Gigabit Switch

The switch does perform DHCP, and it was set to enabled.

Where did you get that switch? That switch is definitely not in the mainstream consumer outlet.

Anyway, having two DHCP servers in the same network would definitely cause problems. You should only have one, let it be the G3100 or the switch. If the switch is doing DHCP, it needs to include appropriate options in the DHCP response to indicate G3100 is the gateway and DNS server.

Also, you should not set static IPs around, unless those are networking devices that need one. The log shows you have IPv6 enabled. I am wondering whether your switch is properly handling IPv6 traffic.

[triumph100]

Been very busy the past couple weeks.  Any further thoughts on things to try?  Would calling Verizon do any good?  Still getting 2-3 disconnects an hour 24x7.

[dexman]

Cang_Household floated some questions and ideas in his latest post. Could those be addressed before moving forward?

[triumph100]

I've removed static IP assignments.  Have also bypassed the switch entirely in question, in addition to making sure DHCP is disabled.  As previously mentioned, was getting the same disconnect issues prior to even having the switch, or setting static IPs.