Why Am I Only Getting 600Mbps on My 1Gbps Fiber Connection?

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Asked By CuriousGadget101 On

I've recently set up a 1Gbps fiber internet connection at my office, but I'm only seeing download speeds of around 600Mbps, while uploads are reaching 1Gbps. I've tried several firewalls, including a model with a 10Gbps SFP+ port, and even a direct connection, but I can't seem to get better than 600Mbps for downloads. The installer suggested that using their provided firewall would ensure I got symmetrical speeds, and indeed, when I tested directly with their firewall, I achieved 1Gbps both ways. My computer and cables seem fine, so I'm puzzled about the settings, like MTU or jumbo packets, that would allow me to match the router without relying on their support, which has been unhelpful. I've mainly tested firewalls with a max MTU of 1500, and I haven't adjusted the NIC MTU while connected directly yet. Any thoughts on resolving this issue?

1 Answer

Answered By SpeedDemonX On

It sounds like the throughput limit could be tied to the processing power of the firewall. Sometimes, firewalls can’t handle higher speeds due to CPU constraints, especially on a single thread. You might want to check if the firewalls you're using are multicore. Also, why does the ISP firewall work directly, but you’re stuck at 600Mbps when bypassing it? It’s odd that a direct connection wouldn’t offer the same speed—maybe it's linked to the hardware differences like the media converter or Eero firewall you mentioned.

TechSavvy95 -

Good point about the CPU! If you can, look up the specs of your firewall. Also, I wonder if multiple IP sockets could help push you closer to that 1Gbps mark.

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