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traviscross / mtr

Official repository for mtr, a network diagnostic tool
http://www.bitwizard.nl/mtr/
GNU General Public License v2.0
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Unable to run mtr in ICMP mode inside of container #444

Open refriedjello opened 2 years ago

refriedjello commented 2 years ago

I am using a RHEL8 box to host a podman container. I have installed mtr inside of it, but am unable to get ICMP or TCP traces working, but UDP ones do. My container is based on the UBI8 image.

Running UDP mode produces the output I would expect, and I see a list of hops and the statistics for each:

mtr -u google.com

Running in TCP mode I only see the first hop:

mtr -T google.com

Same with running in ICMP mode:

mtr google.com

The issue with both TCP and ICMP is that only the first hop is displayed and nothing else. What is interesting, is that the hostname for the first hop will change quickly until settling on the final hop name. Almost like a screen rendering issue.

Seems like the root issue is with how MTR needs to access the network sockets, and needs host level networking to be supplied? Just hoping to get some clarity on how one could get MTR working probably in RHEL8 in a podman container. Thanks!

wenlxie commented 2 years ago

Looks like there is NAT for the container's TCP and ICMP traffic?