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Forum Discussion

superuser2510's avatar
superuser2510
Aspirant
Apr 21, 2026

RS700s reducing speed to 90mbps.

So I have the BGW320 in IP passthrough mode and connected the blue 5GB port from the BGW320 to the WAN port on my RS700s. Intially I had connected the two with a 6ft cat5e cable and was getting a dow...
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CrimpOn's avatar
CrimpOn
Guru - Experienced User
Apr 21, 2026
superuser2510 wrote:

Its shows 100M/Full

Ethernet ports perform autonegotiation when connected.  https://en.wikipedia.org/wiki/Autonegotiation

This is built into the physical hardware.  If the WAN port has decided that the highest speed the link will support is 100M/Full, then because of the overhead that is part of Ethernet, the actual speed measurement will be lower than 100.  Also, anything connected to the RS700 router (no matter what type of cable) cannot possibly measure a higher speed because the WAN link is limited to 100M/Full.

 

This is the problem.  It could be an issue with the actual cable, with one of the RJ45 connectors, or with the RJ45 port on the router or the BGW320.

StephenB's avatar
StephenB
Guru - Experienced User
Apr 22, 2026
CrimpOn wrote:

It could be an issue with the actual cable, with one of the RJ45 connectors, or with the RJ45 port on the router or the BGW320.

The BGW320 LAN ports are ruled out, since the speed didn't change when superuser2510​ moved the cable from its multigig port to the gigabit port.

 

The BGW320 WAN connection is conceivable, but seems unlikely since superuser2510​ reported gigabit speeds before adding the RS700.

 

A broken wire (in the cable or connector) can reduce the speed to 100 mbps.  So that is a possibility.  As is a problem with the WAN port in the RS700.

 

If superuser2510​ has a laptop that supports gigabit, then putting the BGW320 back in router mode and then testing speed using the laptop using both cables would be useful.  Just confirming that the speed is still 900 mbps in that configuration (as reported in the first post).

 

Then maybe reconnect the RS700 while leaving the BGW320 in router mode, and check the speed before switching back to passthrough.  Double-NAT won't affect the speed test.

 

CrimpOn wrote:

I certainly do not purchase Cat5e cables any more.

Neither do I.  But I do still have some installed in-wall, and it is difficult to replace them.