VirtualBox

Ticket #15140 (closed defect: fixed)

Opened 18 months ago

Last modified 18 months ago

Cannot work with MTU sizes larger than 2 KB => Fixed in SVN

Reported by: JFMG Owned by:
Priority: major Component: network
Version: VirtualBox 5.0.14 Keywords:
Cc: Guest type: Linux
Host type: Windows

Description

I have the following setup:

  • Host OS: Windows 7.
  • Guest OS: CentOS Linux 7.
  • Bridged adapter:
    • Host NIC: Intel(R) 82579LM Gigabit Network Connection. This NIC has jumbo packets (9014 bytes) enabled in Windows.
    • Adapter type: any of the three Intel adapter types available.

I set the MTU size to 5000 bytes (using the corresponding "/etc/sysconfig/network-scripts/ifcfg-enp0sx" file) and I succeed ("ip a" command shows it).

Then I try to ping from the guest NIC to the host NIC or vice versa, I can do it with the default ping packet size or even with 2000 byte packet size (which I couldn't before setting the MTU size to 5000 bytes), but not with larger packet sizes. Of course, pinging with larger than 2 KB packets works when I do it between host LAN NICs.

I've tried with a Fedora image and I get the same results.

Attachments

VBox.log Download (69.3 KB) - added by JFMG 18 months ago.
Guest Screenshot 1.png Download (18.4 KB) - added by JFMG 18 months ago.
First part of the screenshot in the guest
Guest Screenshot 2.png Download (19.5 KB) - added by JFMG 18 months ago.
Second part of the screenshot in the guest
Host Screenshot .png Download (18.9 KB) - added by JFMG 18 months ago.
Screenshot in the host

Change History

Changed 18 months ago by JFMG

Changed 18 months ago by JFMG

First part of the screenshot in the guest

Changed 18 months ago by JFMG

Second part of the screenshot in the guest

Changed 18 months ago by JFMG

Screenshot in the host

comment:1 Changed 18 months ago by JFMG

Three more things:

  • I've tried using the latest testbuild with the same results.
  • I've search the forums with no information on this.
  • I created a forum post but got no relevant suggestions.

comment:2 Changed 18 months ago by aleksey

Please try the latest Windows test build. It should solve the issue.

Last edited 18 months ago by aleksey (previous) (diff)

comment:3 follow-up: ↓ 4 Changed 18 months ago by JFMG

Hi aleksey: yes, it does solve the issue. Now it works even with packets bigger than the MTU I define (I don't know why).

Thanks for your prompt support.

comment:4 in reply to: ↑ 3 Changed 18 months ago by aleksey

Replying to JFMG:

Hi aleksey: yes, it does solve the issue. Now it works even with packets bigger than the MTU I define (I don't know why).

Did you do "ping -M do" to disable fragmentation?

Thanks for your prompt support.

You are welcome.

comment:5 Changed 18 months ago by aleksey

  • Summary changed from Cannot work with MTU sizes larger than 2 KB to Cannot work with MTU sizes larger than 2 KB => Fixed in SVN

comment:6 Changed 18 months ago by frank

  • Status changed from new to closed
  • Resolution set to fixed

Fix is part of VBox 5.0.16.

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