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Slow L2TP VPN on ER8411?

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Slow L2TP VPN on ER8411?

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Slow L2TP VPN on ER8411?
Slow L2TP VPN on ER8411?
2023-03-09 15:22:03
Model: ER8411  
Hardware Version: V1
Firmware Version: 1.0.2

Hi! I had an ER605, running an L2TP VPN. It was slow, at 45Mbps, but within specs.

 

I changed it for an ER8411, and it's a bit better, at around 200Mbps, or 25MBps file transfer. I was expecting much more, since it's rated for over 2Gbps, and I have 1Gbps fiber connections on both sides.

 

I also tried OpenVPN but it's barely 10Mbps.

 

Any idea?

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Re:Slow L2TP VPN on ER8411?
2023-03-09 15:35:25

  @Remy4409 

 

What sort of latency do you experience between sites (ie what's the ping time to the far end)? SMB is protocol heavy and not great for transferring over high latency connections.

Chances are you are hitting TCP windowing issues, which will limit the maximum usable throughput PER TCP session:

 

 

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Re:Slow L2TP VPN on ER8411?
2023-03-09 17:31:08

  @d0ugmac1 I get about 3ms. Tried different sites at different distances and latencies, always the same speed.

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#3
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Re:Slow L2TP VPN on ER8411?
2023-03-09 19:07:37 - last edited 2023-03-09 19:07:59

I do have to ask, are you sure that wasn't 25MBps because that would be 200Mbps.

<< Paying it forward, one juicy problem at a time... >>
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#4
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Re:Slow L2TP VPN on ER8411?
2023-03-09 19:16:28

  @d0ugmac1 Yes, like I said in my first post, I get 200mbps, so 25MBps when transfering files. I wanted to get more, since my connections are 1Gbps.

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#5
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Re:Slow L2TP VPN on ER8411?
2023-03-09 19:20:18
If you transfer 2 files at once, do you get ~50MBps or 2 x 12.5MBps? Are you able to use Wireguard instead of your current tunnel tech?
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Re:Slow L2TP VPN on ER8411?
2023-03-09 19:23:08

  @d0ugmac1 If I transfer multiple files at once, it shares the total 25MBps bandwidth, so it splits the speed.

 

I would like to use WireGuard, but AFAIK, it does not exist on the ER8411, even in standalone mode.

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#7
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Re:Slow L2TP VPN on ER8411?
2023-03-09 20:47:01
and what's at the far end of the tunnel? another 8411?
<< Paying it forward, one juicy problem at a time... >>
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Re:Slow L2TP VPN on ER8411?
2023-03-10 02:04:27

  @d0ugmac1 A computer, I was actually able to get much better speeds using IPsec, but now I'm facing another issue, much worse, so I made another post.

 

Thanks for the help!

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#9
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Re:Slow L2TP VPN on ER8411?
2023-03-10 03:50:17

  @Remy4409 one more thing to consider is fragmentation.  Nominally 1500 bytes for ethernet interfaces, the encapsulation and encryption headers needed for L2TP + IPsec make 1400 a safer number for the MSS, maybe set the interface MTU to be 1420 or so.  Not sure if this is exposed to users though.

 

Fragmentation means breaking 1 packet into 2 for  transmission, and then reassembling.  It slows things down for sure!

<< Paying it forward, one juicy problem at a time... >>
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#10
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Re:Slow L2TP VPN on ER8411?
2023-03-10 06:15:52

Hi @Remy4409 

 

Could you please run IPerf test, to check if it is your ER8411 hardware issue? Our SPEC is based on Iperf testing result. 

Connect a test PC to one of the ER8411 WAN port directly. PC and ER8411 WAN should have the static IP in the same subnet. 

Then configure the VPN on test PC;

And run IPerf from test PC to the server in ER8411 LAN network. 

 

Abour how to use IPerf, guide link.

 

Best Regards! >> Omada EAP Firmware Trial Available Here << >> Get the Latest Omada SDN Controller Releases Here << *Try filtering posts on each forum by Label of [Early Access]*
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