Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello Nelson, I faced a similar issue a couple of months ago. It turned out that the problem was originated in NIC chipset: they worked fine for everything except for DRBD. You can verify it by temporarily configuring your resources to be synchronized over another network link (check with lspci that ther is a NIC with different chipset). After verifying that, my only solution was to substitute the failed nics. Massimiliano