Public bug reported:
After upgrading 14.04 to 16.04 I couldn't send big emails with
attachments, I couldn't use google drive. Sometimes lowering the MTU
worked.
I was able to get uploading of large files working again by playing with
MTU probing and discovery:
echo 1 > /proc/sys/net/ipv4/tcp_mtu_probing
echo 1024 > /proc/sys/net/ipv4/tcp_base_mss
Basic MTU related issues should be setup by default, perhaps interfaces
need to updated during upgrade?
Ubuntu 4.4.0-21.37-generic 4.4.6
Without enabling tcp_mtu_probling I couldn't upload large files over
HTTPS and SMTP w/ TLS.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "sudo lspci -vnvn > lspci-vnvn.log"
https://bugs.launchpad.net/bugs/1574933/+attachment/4647337/+files/lspci-vnvn.log
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https://bugs.launchpad.net/bugs/1574933
Title:
Big uploads blocked when upgrading from 14.04 to 16.04 -- TCP MTU
Discovery not properly set.
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