Hash Sum Mismatch network error?

[kiguy2052]

I'm on a fresh install, the only changes have been disabling the enterprise repo and enabling the community repo. I get these hash sum mismatch errors on all nodes(all fresh) on my network. The reported filesize is correct, but all hashes fail. I've tried a few fixes from this post, but none have fixed the issue. I think, because errors persist across installs, the issue must lie with a network setting somewhere(I use Ubiquiti). Could it be possible I'm actually being MitM'ed? How would one even know?

Any suggestions are appreciated, and thanks in advance!

 

[fabian]

are you using a proxy? usually this boils down to one of those three:
- proxy/MITM interfering with the download
- broken memory corrupting the file (unlikely if the messages are always identical even with clearing the local cached files)
- mirror being broken (you could try "ftp.debian.org" instead of "ftp.us.debian.org", it should hit a CDN and be plenty fast anyway)

 

[kiguy2052]

Looks like that fixed the errors from ftp.us.debian.org, but I'm still getting a bunch of the same errors from security.debian.org and download.proxmox.com. The fact that this is happening across repos makes me think either MitM, or some network setting specific to my environment.

 

[kiguy2052]

Looks like the answer may just be time, or maybe my network was more congested 24 hours ago?
https://pastebin.com/p52uB31v

 

[fabian]

or whatever was interfering doesn't any more

 

[kiguy2052]

Yep, eventually I tracked it down to a little 5 port tp-link switch that I thought was unmanaged, but in fact was taking my gateway address as it's factory default. Go figure.

 

[francispaulin]

Yep, eventually I tracked it down to a little 5 port tp-link switch that I thought was unmanaged, but in fact was taking my gateway address as it's factory default. Go figure.

Thank you so much. I was experiencing the same behaviour, and went down multiple deep rabbit holes before finding this post and trying to take my 8 port TP-Link switches out of the network. What do you know, as soon as they were rebooted, things worked as expected!