+ error("Couldn't set prot/AC compression: %m");
+ }
+
+ /* set mtu for ip as well */
+ memset(&ifr, 0, sizeof(ifr));
+ strlcpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
+ ifr.ifr_metric = link_mtu;
+ if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
+ error("Couldn't set IP MTU: %m");