Member Avatar for ricker

Hi all. Hoping somebody here is a genius and can figure this out for me.

I'm using ICS to connect my ps3 to the net from my pc (running xp).
My internet connection that I'm sharing is a wireless N card and N router, 8meg cable.

For the most part it works fine, but after the test is complete on my ps3 and everything passes (nat2, upnp available), it says that the router may not support ip fragments.

I have tried lowering the MTU, but still the same message comes up.

Any help would be appreciated thx.

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Dani AI

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This message means the NAT device along the path dropped or failed to reassemble a fragmented IP packet during the PS3's network test. That can come from three places: the machine doing the NAT (Windows ICS), the upstream router/firewall dropping fragments or ICMP "fragmentation needed" replies, or an intermediate security feature. As suggested, the fastest way to isolate the culprit is to test the console directly on the router (temporary, just for the test) — if the warning disappears the PC/ICS is involved.

Quick diagnostic checklist and tests:

  • Temporarily disable any third‑party firewall and the Windows firewall on the PC and rerun the PS3 test. ICS adds its own NAT/firewall behavior that can interfere with fragmented packets.

  • From the PC, perform a Path MTU test to see what size survives over the path. Example (use a public IP that replies to ICMP):

    ping -f -l 1472 8.8.8.8

    Reduce the -l value until the ping succeeds; that gives a safe MTU to try on the PS3 (add 28 to convert payload to MTU). Try setting the PS3 MTU manually to that number (and test progressively lower: 1400, 1300, 1200).

  • Log into the router and look for security options named like "Block fragmented IP packets", "SPI firewall/DoS protection", or "IP flood protection" and disable them briefly for testing. Also make sure UPnP is enabled on the router (even if the PS3 reports UPnP available, the router-side setting matters).

Practical fixes if ICS is the issue: use a small wireless client/bridge (or a travel router in client mode), a wireless repeater with an Ethernet port, or powerline adapters to get a clean Ethernet feed to the PS3. These remove the ICS double‑NAT/fragmentation variable and are far more reliable for consoles than relying on a PC to share a connection. If NAT Type stays at 2 and games run fine, the warning can sometimes be benign, but the above tests will confirm the source.

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Member Avatar for jbennet

Cant you just plug the PS3 straight into the router instead of connecting it through the PC with ICS?

Games consoles hate ICS, my xbox wont use it at all.

Member Avatar for ricker

I would but its over 50 feet away. My pc gets a way better wireless signal than the ps3 so that's why I'm using ICS

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