I’m having issues with my Docker setup as it relates to networking between them. I noticed the issue by exec’ing into a container and trying to ping another container within the same Docker network. [Screenshot 2024-11-20 at 12.17.40 PM] Seemingly completely random packet loss. When this happens …

Things that come to mind: collision between the container network ip ranges and physical network ip ranges A container with --privileged or NET_ADMIN capabilities runs wild (like a vpn container?) Host has a failover ip (CARP/VRRP) or it’s dns server or default gateway ip are a failover ip. Thoug…

Thanks for the guidance. I’m not seeing any issues related to the 3 points you made: There are no other network IP ranges on my network with 172.19.x.x I went through all my containers and none are privileged, nor do any have any cap_add’s whatsoever. As far as I’m aware I’ve never set up failover…

Linked issue with potential cause for anyone with a similar issue: [image] Intermittent "host unreachable" between 2 containers (only!) General Just becuse I noticed the similarity as well and that’s why I came here remembering this topic, I share the other one It is s…

Packet Loss Between Containers

General

asandhu3 (Asandhu3) November 22, 2024, 8:29pm 4

Linked issue with potential cause for anyone with a similar issue:

Topic		Replies	Views
Packet loss on server running Docker Docker Hub	0	744	May 3, 2020
Intermittent "host unreachable" between 2 containers (only!) General docker , portainer , networking , linux	13	943	November 24, 2024
Docker Containers Have Major Communication Issues General	1	378	April 1, 2025
Docker causes packet loss on intranet connections (Ubuntu Host) General	0	1861	September 5, 2016
Two containers with same network can NOT ping each other General docker	0	897	July 9, 2019

Packet Loss Between Containers

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