I found the issue that was breaking my amanda dumps. Using the ip_conntrack_amanda component (either compiled into the kernel or loaded as a module) corrupts the packets by replacing one LF by a NUL byte. This in consequence invalidates the checksum, causing the packets to be discarded. Workaround: unload ip_conntrack_amanda. Fix: I've sent a patch in separate mail, Subject: [BK PATCH] Fix ip_conntrack_amanda data corruption bug that breaks amanda dumps -- Matthias Andree - : 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