Hi, I am trying to set up IP over fibre channel using the mptlan.o module. Our HBAs are 1Gb copper boards based upon the EOL'd LSI FC909 controller. We are running into strange problems with ARP exchanges. The problem seems to be that once a node sends a frame, no other machine can successfully transmit one. Thus, if I try to ping machine B from machine A, B will get a valid ARP broadcast frame. It will attempt to send a unicast response, but the response packet will never be sent over the wire, and the TX error counter will incremented in machine B's interface statistics. B's arp table now hold's A's IEEE802 address, and A just goes on sending ARP requests forever. I have been using tcpdump to get hex dumps of traffic over the fibre LAN interfaces. The ARP requests and responses look perfect, and the problem appears to be at a lower level. I understand that most of the development and testing work on mptlan was done on the fc919 and fc929 ASICs, so I'm wondering if these old fc909 boards will play at all. I have seen this behavior on 2.4.19 through 2.4.21. I have not tried older kernels, but would be willing to do so. I know that the boards are functional because they have no problem doing block IOs with my fibre disk arrays. In order to remove some of the complexity, I also tried plugging two 2.4.21 boxes together in a point-to-point. This setup produced identical results to my tests on the switched fabric. I am rather new to fibre channel, so it is quite possible that I am just doing something stupid. If anyone has any ideas, please let me know. Thanks, Tom Keiser tkeiser@cede.psu.edu - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
