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Docker container not reachable, bad TCP checksums #16841
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The issue persisted after upgrade to docker 1.8.2. Issue resolved by changing the host firewall settings. |
Can you please provide some info on the firewall settings that needed to be changed to resolve this |
Hi,
We are unable to reach the ports n the container directly or mapped.
INFO
This is our additional settings:
The running container with the interface vethc356415 is a Discourse container. These are its host and network settings:
From inside of the container we are able to ping websites:
We are also able to get the index page of Discourse with wget (eg. doing a wget localhost from inside of container).
The problem is when we try to reach the container from outside (eg. from the Docker host):
or
does not work and hangs. When we tried sniffing the traffic on docker0 interface we found out that there is a TCP checksum problem:
Seems like the docker container sends packets that are dropped because of bad checksums (?). We tried to disable any kind of offloading on the vethc356415:
with no results. Right now we are stuck. Is this an issue or a configuration problem ?
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