VirtualBox

Opened 8 years ago

Closed 8 years ago

#15140 closed defect (fixed)

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

Reported by: JFMG Owned by:
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 (4)

VBox.log (69.3 KB ) - added by JFMG 8 years ago.
Guest Screenshot 1.png (18.4 KB ) - added by JFMG 8 years ago.
First part of the screenshot in the guest
Guest Screenshot 2.png (19.5 KB ) - added by JFMG 8 years ago.
Second part of the screenshot in the guest
Host Screenshot .png (18.9 KB ) - added by JFMG 8 years ago.
Screenshot in the host

Download all attachments as: .zip

Change History (10)

by JFMG, 8 years ago

Attachment: VBox.log added

by JFMG, 8 years ago

Attachment: Guest Screenshot 1.png added

First part of the screenshot in the guest

by JFMG, 8 years ago

Attachment: Guest Screenshot 2.png added

Second part of the screenshot in the guest

by JFMG, 8 years ago

Attachment: Host Screenshot .png added

Screenshot in the host

comment:1 by JFMG, 8 years ago

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 by Aleksey Ilyushin, 8 years ago

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

Last edited 8 years ago by Aleksey Ilyushin (previous) (diff)

comment:3 by JFMG, 8 years ago

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.

in reply to:  3 comment:4 by Aleksey Ilyushin, 8 years ago

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 by Aleksey Ilyushin, 8 years ago

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

comment:6 by Frank Mehnert, 8 years ago

Resolution: fixed
Status: newclosed

Fix is part of VBox 5.0.16.

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