The router is probably a Philips. Your ISP should be able to guide you since they have put their name on it; they can't escape from that.
See this page, it has the default settings, I think (though it probably should be ... philips ... you can tell the folks at TalkTalk
):
http://www.phillips.talktalk.net/firewall_spi_h.html" onclick="window.open(this.href);return false;
Since it has been known for so long I wonder if this still happens, that networks take part in a Smurf attack. The "Discard ping to WAN interface", that you probably will find at the same page in the router settings, i.e. Security > Firewall > Intrusion Detection, is the one I mentioned earlier in the old post, it will stop the router from responding to ICMP Echo Request packets, so it will not take part in an attack. I would not touch the settings you posted, I think they are the default, or close to the default; but it possible that they can be tweaked a bit to change the router's behaviour.
Back to your original post; you mentioned lots of "Smurf messages" in the log; how often did you see these? I wonder if the router has identified it correctly
or if it's something else. I understand that seeing multiple log entries at same time as a slowdown in the Internet connection might seem suspicious.
Is the first part of the IP address you mentioned above 169? I.e. 169.254.255.255, then it's an "auto-configured" address for a device that can't access a DHCP. In a smurf attack, as I understand it, the source address of the Echo Request packets has been forged, not those responding, sending the Echo Reply; it looks odd. Have you connected other devices to your router recently?
Anyhow, in case of a Smurf attack, as a victim it is not much one can do, but to contact one's ISP. In this case, even if it isn't a smurf attack, I think it would be a good idea to call your ISP.
Byelingual When you speak two languages but start losing vocabulary in both of them.