Begin forwarded message: Date: Tue, 28 May 2019 15:49:52 +0000 From: [email protected] To: [email protected] Subject: [Bug 203743] New: Networking goes down when running Docker and receiving fragmented IPv4 packets https://bugzilla.kernel.org/show_bug.cgi?id=203743 Bug ID: 203743 Summary: Networking goes down when running Docker and receiving fragmented IPv4 packets Product: Networking Version: 2.5 Kernel Version: 4.15.0-1032-aws Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: IPV4 Assignee: [email protected] Reporter: [email protected] Regression: No We are experiencing an issue where our EC2 instances fail instance status checks and completely lose networking because of cellular UDP traffic going to an instance. It seems that when sending UDP traffic using T-Mobile cellular the packets are fragmented and causes the system to completely lose networking because of this. I have attached the source code for the iOS app that can reliabily reproduce this issue as well as the server code to receive the traffic. The packet capture of the traffic is attached as well. Also important to note that the system only drops networking when Docker is running, but the fragmentation also happens no matter if Docker is installed or not. It's also worth pointing out that when sending the traffic over Cellular to a local network at our office that the traffic is not fragmented. This makes me think that there is an issue with networking between T-Mobile and AWS. Base AWS AMI: ami-0a313d6098716f372 Instance Types: g3.4xlarge or c5.2xlarge Docker GitHub Issue: https://github.com/docker/for-linux/issues/672 iOS app: https://github.com/docker/for-linux/files/3192116/LockUpDemo.zip Server app:https://github.com/docker/for-linux/files/3192118/main.c.zip tcpdump capture: https://github.com/docker/for-linux/files/3192155/capture.pcap.zip -- You are receiving this mail because: You are the assignee for the bug.
