Xnet VFX with Cisco SRP527W connected through NetComm NP805N router from Vodafone

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alaw005

37 posts

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#130769 27-Sep-2013 10:08

I am providing this post in case it might help some others. I have just signed up with Vodafone on Telstra network and am now getting 100mbps connections. However, keeping my Xnet VFX was a little bit of a pain as Xnet said I needed to connect by vfx devide (SRP527W) directly to the cable modem but this was slower than the gigibit wireless router provided by Vodafone (NP508N). THe following are some notes I recorded for myself, please feel free to ask questions ... although I am not an expert (Google is). Better yet please feel free to contribute further tips, especially additional settings that might improve performance (I haven't load tested).

I am trying to configure Cisco SRP527W to continue providing VOIP services (and additional ethernet ports) behind the new Netcomm NP805N Gigabit router provided by Vodafone. I am not using the SRP527W as the primary router (as told to be Xnet) because I am now on cable and my speed tests were ~50mbps on the SRP527W rather than the ~90mbps I am getting on the NP805N. No point paying for the extra speed if I can't use it!

I have already connected the NP805N router with fixed IP address, WIFI etc for internet access and with local network IP address of 192.168.15.1. The DHCP range for local network is 100-110, with fixed addresses for the SRP527W (192.168.15.100) and a microserver (192.168.15.104). I turned SIP ALG off on the NP805N (Toolbox --> Miscellaneous) as instructed by link below - I assume this so only the SRP527W is doing the SIP inspection. Internet working fine through NP805N.

The SRP527W LAN/WAN port (port 4) is connected to one of the NP805N ethernet ports. For his to work I had to do a factory reset of the SRP527W and log in as admin user (not cisco user) to turn off "switching mode" (this option is only available after factor reset, I think under Admin tab - can't find link for that instruction). The SRP527W should get the 192.168.15.100 IP address above for the WAN. I then set it up on separate subnet with Its own local address at 192.168.20.1 and providing DHCP in this subnet range. This was necessary to avoid conflicts with above.

Provided VOIP was already provisioned the phone just worked when I tested, although no incoming calls. I had to open up port 5060 on the NP805N router to allow incoming calls.

Some relevant(?) links:

This link provided the port number that I need to forward http://help.xnet.co.nz/questions/121/3CX+v10.0+Setup+instructions
This link told me to turn SIP ALG off on the NP805N http://www.voipvoip.com/customer-care/voip-router.html
This may help https://supportforums.cisco.com/thread/2172393

PeterReader

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#903571 27-Sep-2013 10:08

Hello... Our robot found some keywords in your post, so here is an automated reply with some important things to note regarding broadband speeds.

If you are posting regarding DSL speeds please check that

- you have reset your modem and router

- your PC (or other PCs in your LAN) is not downloading large files when you are testing

- you are not being throttled by your ISP due to going over the monthly cap

- your tests are always done on an ethernet connection to the router - do not use wireless for testing

- you read this topic and follow the instructions there.

Make sure you provide information for other users to help you. If you have not already done it, please EDIT your post and add this now:

- Your ISP and plan

- Type of connection (ADSL, ADSL2, VDSL)

- Your modem DSL stats (do not worry about posting Speedtest, we need sync rate, attenuation and noise margin)

- Your general location (or street)

- If you are rural or urban

- If you know your connection is to an exchange, cabinet or conklin

- If your connection is to a ULL or wholesale service

- If you have done an isolation test as per the link above

Most of the problems with speed are likely to be related to internal wiring issues. Read this discussion to find out more about this. Your ISP is not intentionally slowing you down today (unless you are on a managed plan). Also if this is the school holidays it's likely you will notice slower than usual speed due to more users online.

A master splitter is required for VDSL2 and in most cases will improve speeds on DSL connections. Regular disconnections can be a monitored alarm or a set top box trying to connect. If there's an alarm connected to your line even if you don't have an alarm contract it may still try to connect so it's worth checking.

I recommend you read these two blog posts:

- Is your premises phone wiring impacting your broadband performance? (very technical)

- Are you receiving a substandard ULL ADSL2+ connection from your ISP?

I am the Geekzone Robot and I am here to help. I am from the Internet. I do not interact. Do not expect other replies from me.

RunningMan

8965 posts

Uber Geek

#903876 27-Sep-2013 17:14

Why not sell the SRP527, and get a SPA112 or similar, as you are now not using the majority of the feature of the SRP.

sbiddle

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#903881 27-Sep-2013 17:39

I'm interested in the slow speed as the SRP521W/527W will both route ~90Mbps from WAN->LAN.

Did you have any sort of custom QoS enabled?

techo

46 posts

Geek

#903929 27-Sep-2013 20:34

Sounds like a half-duplex issue to me. Did the SRP have speed and duplex forced (disabling auto-negotiation) hence the cable modem auto-negotiation would fall-back into half-duplex mode.

alaw005

37 posts

Geek

#903959 27-Sep-2013 22:18

I did look at the SPA122 but can't see that there would be any gain over current setup - it would still have to go through the NP508N as that is still the faster device. In any event one phone port on the SRP527W is faulty so I doubt there would be sufficient $$ in selling it to make worthwhile. At least not until I want to get two VOIP lines.

The SRP527W is as per factory settings, except for the change to switching mode and IP settings. I have double-checked and can confirm there is no QoS enabled and duplex settings are auto-negotiate. I don't know how to check what is actually being negotiating though.