iperf -c Windows SYN - Window 64kb, Scale 1 - Linux SYN, ACK: Window 14kb, Scale: 9 (*512).The latter figure can vary significantly on subsequent tests, (Vagaries of AWS) but is usually between 70 and 130Mbit/s which is more than enough for our needs. I broke out iperf -s on a an AWS instance and then from a Windows client in the office: This bore out in testing and from multiple locations clients were seeing stable 2-5Mbit/s to the host from their Windows systems. The initial report was that uploads to a new server instance were much slower than they could be. We have 1Gbit/s synchronous bandwidth at the office and the servers are either AWS instances or physically hosted in US DCs. Hence, if you either see no output or if the l4_chk_sum is set to 1, that means the L4 checksum is enabled on the network processor.Scenario: We have a number of Windows clients regularly uploading large files (FTP/SVN/HTTP PUT/SCP) to Linux servers that are ~100-160ms away. If it's manually enabled, 'l4_chk_sum' is set to 1.
Strict TCP/IP checksum: False show system state | match l4Ĭfg.hw.fe100: īy default, l4_chk_sum is enabled when you run the above command and you would see no output. TCP: 90 secs, UDP: 60 secs, SCTP: 60 secs, other IP protocols: 60 secs SCTP timeout before SHUTDOWN received: 30 secs SCTP timeout before COOKIE received: 60 secs SCTP timeout before INIT-ACK received: 5 secs Number of sessions created since bootup: 4785 Strict TCP/IP checksum: True set session strict-checksum no TCP: 90 secs, UDP: 60 secs, other IP protocols: 60 secsĪccelerated aging threshold: 80% of utilization TCP session timeout for unverified RST: 30 secs TCP session delayed ack timeout: 250 millisecs TCP session timeout in TIME_WAIT: 15 secs TCP half-closed session timeout: 120 secs TCP session timeout before 3-way handshaking: 10 secs TCP session timeout before SYN-ACK received: 5 secs Number of sessions created since bootup: 0 Here is how you check if the L4 checksum is enabled on the dataplane, which is enabled by default: In PA-5200 and PA-3200, there is an additional validation of L4 checksum on the network processor. For more information, please refer to the following article: Packet Flow Sequence in PAN-OS (section 2.1). This checksum is done during ingress stage packet parsing stage. The L4 checksum is calculated and validated on dataplane on all PAN-OS devices. Learn how to understand L4 checksum on Palo Alto Networks firewall.
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