Hi Casperites, I have a simple ROACH 1 design streaming packets via two 10GbE ports (clock:160 MHz). When I compile the design using old libraries (XSG: 11.4, Matlab 2009), I have no issues in receiving packets via sockets. When I compile the same design using newer libraries (XSG:14.7, Matlab2013a), I can receive packets via tcpdump but I get bad checksum and I cannot capture the packets using standard methods (e.g. recvfrom()). An example of the checksum error is shown below:
*tcpdump: listening on eth2, link-type EN10MB (Ethernet), capture size 262144 bytes16:04:58.998384 02:02:0a:00:00:1f > 00:25:90:63:13:ac, ethertype IPv4 (0x0800), length 8242: (tos 0x0, ttl 255, id 0, offset 0, flags [DF], proto UDP (17), length 8228, bad cksum 63a8 (->47a0)!) 10.0.0.31.48400 > 10.0.0.10.48500: [no cksum] UDP, length 8200 0x0000: 0025 9063 13ac 0202 0a00 001f 0800 4500 0x0010: 2024 0000 4000 ff11 63a8 0a00 001f 0a00 0x0020: 000a bd10 bd74 2010 0000 0000 0027 8734* I validated the payload in the udp packets by sending counter values. Has anyone experienced this issue before? Cheers, Kaustubh
