Ethernet network intermittently failing "Request timeout for icmp_seq ..."

[HDFan]

Mac Studio 15.1. This problem started with Sonoma and seems to have gotten worse. My ethernet connection randomly stops working, and the starts again:

ping 10.0.0.1

64 bytes from 10.0.0.1: icmp_seq=49588 ttl=64 time=32465.163 ms
64 bytes from 10.0.0.1: icmp_seq=49589 ttl=64 time=32513.627 ms
Request timeout for icmp_seq 49622
64 bytes from 10.0.0.1: icmp_seq=49590 ttl=64 time=33141.394 ms
64 bytes from 10.0.0.1: icmp_seq=49591 ttl=64 time=33685.144 ms
Request timeout for icmp_seq 49625
64 bytes from 10.0.0.1: icmp_seq=49592 ttl=64 time=34555.990 ms
64 bytes from 10.0.0.1: icmp_seq=49593 ttl=64 time=34858.723 ms
Request timeout for icmp_seq 49628
64 bytes from 10.0.0.1: icmp_seq=49594 ttl=64 time=35199.069 ms
64 bytes from 10.0.0.1: icmp_seq=49595 ttl=64 time=35362.087 ms
64 bytes from 10.0.0.1: icmp_seq=49596 ttl=64 time=35495.626 ms
64 bytes from 10.0.0.1: icmp_seq=49597 ttl=64 time=35698.640 ms
64 bytes from 10.0.0.1: icmp_seq=49598 ttl=64 time=35774.156 ms
64 bytes from 10.0.0.1: icmp_seq=49599 ttl=64 time=35472.642 ms
Request timeout for icmp_seq 49635
Request timeout for icmp_seq 49636
Request timeout for icmp_seq 49637
Request timeout for icmp_seq 49638
Request timeout for icmp_seq 49639
Request timeout for icmp_seq 49640
Request timeout for icmp_seq 49641
Request timeout for icmp_seq 49642
64 bytes from 10.0.0.1: icmp_seq=49607 ttl=64 time=36239.919 ms

I have uninstalled Sophos and Little Snitch but makes no difference. I have turned off stealth mode. NextDNS is still running since I don't know how to easily stop it. Connected directly to my Comcast modem, bypassing the 10 GbE switche and Cisco firewall. Nothing changes.

 

[Bigwaff]

… and you have changed out the Ethernet cable for a different one? CAT5? CAT6?

 

[gank41]

FWIW, I'm seeing a similar issue on both my 2018 Intel Mac mini (Wired Ethernet Connection) and my M1 MBP (Connected to an OWC Dock w/ Ethernet Cable Connected). I use iStat Menus and have an alert setup when my Internet connection changes, and I see my connection drop often, but usually only long enough to cause a delay, not long enough for a web page to time out.

 

[SG-]

try disabling the built-in firewall. also are you actually seeing extremely terribly network usage with safari and downloads? with that latency your internet would actually be unusable.

 

[HDFan]

and you have changed out the Ethernet cable for a different one? CAT5? CAT6?

Changed to a CAT8. No difference.
Changed to Wifi. No difference.
Changed to test user. No difference.


One other problem is that the system keeps renaming itself, saying that the name is in use, which causes network apps, such as Plex, to fail.

 

[mfram]

Another possibility is that you have an IP address conflict on your network. What you're showing would be a symptom. The most likely cause is that there are two different DHCP servers running on your network, each giving out IP addresses independently of one another. That is, two different "routers". Another possibility is that you've programmed both machines to share the same ethernet hardware address.

If you are using static IP address, then you might have two machines configured to use the same IP address.

 

[gilby101]

ping 10.0.0.1

Pings to that address do not go outside your local network. So you certainly have a local network problem.

Is 10.0.0.1 the IP address of router/modem?
What is the IP address of your Mac Studio?
What are other IP addresses on your LAN?

arp -a might help as it will tell you the MAC and IP addresses of all devices your Mac Studio knows about.

As @mfram says, most likely an address conflict. Or faulty router.