I guess the SYN/ACK will get hashed on the same tunnel link if you
disable accelerated networking.
When accelerated networking is enabled on Azure, all incoming TCP SYN
packets are still received through the software NIC netvsc and get the
RX hash values from Hyper-V virtual switch, but the ACK pa
Hi everyone,
I noticed a behavior that I'm not sure if it's to be expected after this
patch or not.
SRC VM --> Router VM (with accelerated networking / Mellanox driver) -->
2 tunnel links ECMP --> destination VM
Seems that inside a single flow:
- SYN from SRC VM gets hashed on tunnel link one on
This bug was fixed in the package linux-azure - 4.15.0-1103.114~16.04.1
---
linux-azure (4.15.0-1103.114~16.04.1) xenial; urgency=medium
* xenial/linux-azure: 4.15.0-1103.114~16.04.1 -proposed tracker (LP:
#1907619)
[ Ubuntu: 4.15.0-1103.114 ]
* bionic/linux-azure-4.15: 4.15.0
This bug was fixed in the package linux-azure-4.15 - 4.15.0-1103.114
---
linux-azure-4.15 (4.15.0-1103.114) bionic; urgency=medium
* bionic/linux-azure-4.15: 4.15.0-1103.114 -proposed tracker (LP:
#1907621)
* [linux-azure] IP forwarding issue in netvsc (LP: #1902531)
- hv_net
This bug was fixed in the package linux-azure - 5.4.0-1035.36
---
linux-azure (5.4.0-1035.36) focal; urgency=medium
* focal/linux-azure: 5.4.0-1035.36 -proposed tracker (LP: #1907589)
* [linux-azure] IP forwarding issue in netvsc (LP: #1902531)
- hv_netvsc: record hardware ha
** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: In Progress => Fix Committed
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** Description changed:
+ [Impact]
+
We identified an issue with the Linux netvsc driver when used in IP
forwarding mode. The problem is that the RSS hash value is not
propagated to the outgoing packet, and so such packets go out on channel
0. This produces an imbalance across outgoing
Following the regular SRU, I would expected it to be included to the
next cycle with release date planned for the week of Jan 25. Please, if
you can, let me know today if this date works for you. Thanks!
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Marcelo, will these fixes be avaiable in the last SRU cycle of 2020?
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Title:
[linux-azure] IP forwarding issue in netvsc
Stat
Thanks, Marcelo! I tested all the 3 kernels and they worked as we
expected.
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Title:
[linux-azure] IP forwarding issue in netvs
Hi, Joseph.
I've built test kernels for xenial:linux-azure, bionic:linux-azure-4.15
and focal:linux-azure. You can find them at:
https://kernel.ubuntu.com/~mhcerri/azure/lp1902531/
Inside each directory, I included all the kernel .deb files and also a
tarball containing the same .debs. The patch
** Also affects: linux-azure-4.15 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux-azure (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-azure-4.15 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-azure
If possible, can we also get a test kernel for this bug when avaiable?
Folks would like to confirm the two patches fix the issue prior to
release of the image.
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This is the network config. Let me know if you need more info.
** Attachment added: "network-config.png"
https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1902531/+attachment/5430820/+files/network-config.png
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P
To use Azure UDR, I referred to this page:
https://campus.barracuda.com/product/cloudgenfirewall/doc/72516173/how-
to-configure-azure-route-tables-udr-using-azure-portal-and-arm/
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Here is how I reproduce the bug:
Create 3 Ubuntu 16.04 VMs (VM-1, VM gateway, VM-2) on Azure in the same
Resource Group. The kernel should be the linux-azure kernel
4.15.0-1098.109~16.04.1 (or newer). I use Gen1 VM but Gen2 should also
has the same issue; I use the "East US 2" region, but the iss
It would be great if we can get the fixes into the next SRU cycle, which
is the last one for 2020.
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Title:
[linux-azure] IP fo
I'll provide the instructions to reproduce the bug on Azure.
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Title:
[linux-azure] IP forwarding issue in netvsc
Status in li
Since the 5.0 linux-azure kernel is not maintained anymore, IMO we don't
have to fix this bug for it.
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Title:
[linux-azure] IP
The 5.0 linux-azure kernel is not maintained anymore. Do you have any
scenario that is still using this kernel?
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Title:
[linux
Thanks for reporting the issue and for providing the back ported fixes.
Do you have any instructions that we can use to reproduce and test the
problem?
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