kernel-packages team mailing list archive

[Abram Hindle <1574933@xxxxxxxxxxxxxxxxxx>]

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.

Status in linux package in Ubuntu:
  New

Bug description:
  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.

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