Testing on hosts with firewalls

[Florian Weimer]

On 12/30/2016 12:35 AM, Mike Frysinger wrote:
> 	/* Equiv of `ip link set up lo`.  Kernel will assign 127.0.0.1 for us. */
> 	strcpy(ifr.ifr_name, "lo");
> 	if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0)
> 		err(1, "ioctl(SIOCGIFFLAGS) failed");
>
> 	/* The kernel preserves ifr.ifr_name for use. */
> 	ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
> 	if (ioctl(sock, SIOCSIFFLAGS, &ifr) < 0)
> 		err(1, "ioctl(SIOCSIFFLAGS) failed");

Thanks, this works.

Initial testing shows that my DNS tests are now much more reliable.  In 
fact, I could no longer reproduce those dropped packets.  This looks the 
way to go.

Florian