With this Blaster and Welchia crap still going around, we've been watching ICMP (Welchia) packets pretty closely. When I took my server down for a bit to update to Steam, I noticed the following packets:
09:06:07.869320 telefragged.lynchburg.edu > amarseille-202-1-6-49.w80-15.abo.wanadoo.fr: icmp: telefragged.lynchburg.edu udp port 27015 unreachable [tos 0xc0]
Is there any documentation on these packets getting sent out? Is this part of Linux? Or something HLDS related? Can it be disabled?
Actully these ICMP packets are been send from your machine because clients from other IPs are trying to connect into your machine. As your port is closed (down), your machine are telling them "udp port 27015 unreachable".
No need to worry, it's a normal procedure of IP.
If you want to disable something, cut off the following icmp types: router-solicitation, (TOS)-host-redirect, (TOS)-network-redirect, timestamp-request, address-mask-request, timestamp-reply and address-mask-reply.
If you are really paranoid, cut off echo-request and be "down" to pings.
-- dual_bereta_r0x -- Alexandre Hautequest ArenaNetwork Lan House & Cyber -- www.arenanetwork.com.br
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