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Bug #14937

open

Random UDP loss

Added by Roman Kuznetsov 6 months ago. Updated 6 months ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
Routing
Target version:
-
Start date:
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:
Default
Affected Version:
2.7.0
Affected Architecture:
amd64

Description

Hi,

After upgrading from pfsense CE 2.5 to 2.7 some UDP packets started unexpectedly to loss on GRE interface.

Let me show the path of sending packets -
computer in vlan_A sends packet from port 3305 -> net_vlan_A -> pfsense site A -> GRE -> pfsense site B -> net_vlan_B -> computer in vlan_B to port 3310
So I can see my packets on pfsense vlan_A interface via tcpdump, but they dissapear on GRE.

Take a look on screenshots I attached to this issue.
On first screenshot is shown sending different packets via netcat, on the second which packets I can see on GRE.

Moreover, if i change source or destination ports, traffic goes well.

I don't have any rules for certain ports 3305 and etc.

The issue is really hard to catch, sometimes traffic goes right, sometimes is not.

Can I ask for your help to investigate this issue? If you need more information please let me know.

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at2.jpg (54.4 KB) at2.jpg screenshot2 Roman Kuznetsov, 11/01/2023 10:52 PM
at1.jpg (54.8 KB) at1.jpg screenshot1 Roman Kuznetsov, 11/01/2023 10:52 PM
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 #1

Updated by Kris Phillips 6 months ago

Hello,

Can you run a packet capture on both the originating and remote firewall narrowed down to just the appropriate test hosts and UDP ports? Please attach that pcap file here for review.

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