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k5egg
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Routerboard 750G vs Speedstream 4300 modem ethernet issues

Sat Jan 08, 2011 5:23 am

I posted a couple months ago about using an RB750G as a PPPoE server for a chunk of clients - it works great except for one small issue. Every few seconds/minutes (varies from 10 seconds to 10 minutes, usually closer to once per minute) I seem to lose the ethernet link between the ADSL2 modems (SpeedStream 4300) and the 750G. Locking the port to 10mbit/half duplex will make it stable, but it makes the ethernet the bottleneck (12/1 connections)

The RB is running ros4.16 with 2.28 firmware installed.

Thanks!
 
andreacoppini
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Re: Routerboard 750G vs Speedstream 4300 modem ethernet issu

Sat Jan 08, 2011 11:15 am

Try a different physical port. Usually port 1 uses the CPU's built in Ethernet interface while 2-5 use a dedicated Ethernet chip. So if you're using Eth1 on the RB750, try moving to Eth2 instead, and vice versa.

This used to happen to us all the time with the RB532 and some DSL or Cable modems.
 
k5egg
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Re: Routerboard 750G vs Speedstream 4300 modem ethernet issu

Sat Jan 08, 2011 12:24 pm

Try a different physical port. Usually port 1 uses the CPU's built in Ethernet interface while 2-5 use a dedicated Ethernet chip. So if you're using Eth1 on the RB750, try moving to Eth2 instead, and vice versa.

This used to happen to us all the time with the RB532 and some DSL or Cable modems.
Unluckily theres 3 modems in load balance, they're currently connected to ports 3,4,5 so most likely the problem wouldn't exist if it was on port 1. I have verified it doesn't occur when using a RB750, but I *do* run out of CPU. I suspect a RB493AH may be my best reasonable cost/low-power solution.
 
andreacoppini
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Re: Routerboard 750G vs Speedstream 4300 modem ethernet issu

Sat Jan 08, 2011 12:26 pm

how about using a little switch connected to port 1, then connect the modems to the switch?

I know it's not ideal because you're adding a point of failure, but it may be a quick stop-gap solution.
 
k5egg
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Re: Routerboard 750G vs Speedstream 4300 modem ethernet issu

Sat Jan 08, 2011 1:02 pm

how about using a little switch connected to port 1, then connect the modems to the switch?

I know it's not ideal because you're adding a point of failure, but it may be a quick stop-gap solution.
Would be messy without a managed/vlan switch. I have the Speedstream 4300's configured as dumb bridges, have the 750G acting as the DSL PPPoE clients (gets me two usable IPs instead of just 1 with the router eating up the second...)
 
k5egg
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Re: Routerboard 750G vs Speedstream 4300 modem ethernet issu

Sun Jan 09, 2011 6:00 am

Went out there and replaced the RB750G setup with an RB493AH (I had one onhand, yay) and noticed the uplink radio (nanostation M5)'s lan port kept blinking completely off for a couple seconds at a time. Totally explains the rest of the network issues I was seeing.

I'm guessing I've either got a saggy power supply or a bad routerboard. Either one is a definite possibility! Its not repeating itself with the RB493AH, so far.

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