HG612 IP Address

What is the default IP address for the modem?

Edited by MHC (Sat 06-Sep-14 15:58:38)

The Manual says:

By default, the IP address of the LAN interface of the HG612 is 192.168.1.1

What's wrong with Google?

That is what I thought.

However, I run my local network on 172.xx.xx.xx and with 172.xx.xx.1 I cannot access through Telnet. I can get to the GUI on LAN2 using .123 (allocated by me) but that does not show the information I need.

Edited by MHC (Sat 06-Sep-14 18:44:10)

Because it says 192.168.1.1 ... which I what I thought.

I think you telnet on .123 as well.

You need to use the IP address you have given it for telnet as well, so the same one you access the GUI by.

Also note that a firmware update does not alter the IP address.

Thanks, or some reason I was thinking I needed to access though LAN1 and not LAN2.

Now to try and get BT to sort out my problem ...

Currently though GUI Upstream Attainable is 22308 and SNR margin 7.1,

BT tester further diagnostics Max Achievable 20Mbps, Upload speed 8.92Mbps.

Speedtests on TBB and others give around 9 to 9.5


Had the problem 18 months back and it was a pain to sort out ... it had held up at 18+ Mbps since then and it was only when BT asked me to reboot the modem and change my local IPs to the 198.xx.xx.xx range to sort another issue did it drop back to 9Mbps. At the same time though my downstream went from 58 to 67 so I was wondering if the negotiated bandplan had was non-standard or corrupted but it looks fine.

In the stats it's "Bearer" that is the sync speed. Not the "Max".

What does that show?

Re the BT Further Diagnostics, the downstream IP Profile is valid, but the upstream is always 2, 10 or 20Mbps depending on the product. Nothing directly to do with the sync.

It give 19999 - as expected. The reason I quoted attainable was to show that the line should be able to support 20.

I have had the problem before and it took several days of BT Tech onsite to resolve it. It just suddenly went from 9.5 to 18.5 ...

Perhaps the BRAS hasn't been updated by the router?

Who knows? Original thoughts last time was a profile error somewhere in a back office system that was being propagated through, or not being updated correctly ...

Everything suggests 20Mbps is easily achievable, results from Speedtests show it has been that way for 18 months ... and why should a single reboot cause the problem?

Do you have a HH5 you can use instead of the modem and router?

In reply to a post by BatBoy:

Do you have a HH5 you can use instead of the modem and router?

No, but it would not work anyway. I use the VOIP interface on the 2701 to provide two voice circuits.

The Business version was tried previously and the problem remained. Changing between Huawei and ECI modems does not resolve it - although ECI gives 2 Mbps faster download.

As I understand it, the router is responsible for updating the BRAS

How or why? What information do they hold that the Modem does not? The User name and password, maybe, but little else. The BT speedtester acknowledges that I should have a 20Mbps upload so that is correct.

As it happens I have tried it using a couple of 2701s, and Business Hubs with no difference.

The BRAS is responsible for limiting the thoughput to ensure you don't flood the modem and cause it to drop packets. The BRAS needs to have the correct IP profile information. Perhaps ask BT to reset the BRAS?

SIN 498 says:

1.2.1 VDSL2 rates
The upstream and downstream VDSL2 data rate is reported to the CP BRAS/Radius upon PPP discovery (a similar mechanism exists for DHCP � see Section 2.1.7 ).

and:

2.1.6 Downstream shaping
The CP is expected to shape the downstream traffic to match the actual VDSL2 line rate in order to avoid excessive traffic loss. CPs should be aware that the mechanism for reporting the downstream and upstream line rates relies on a line re-train causing the CP, or the CPE, to initiate a new PPP session or a new DHCP request. The success of this method of line rate reporting is down to the CP's choice of timers used around PPP/DHCP handling. If the PPP/DHCP survives a re-train, then the CP will be unaware of any change in the line rate and will not be able to shape appropriately. The line re-train time for VDSL2 can be anywhere between 10 and 60 seconds, with typical values in the 20-30 second range.
As DHCP typically uses lease timeouts in the order of days rather than seconds, CPs intending to use DHCP are advised to consider the impact of downstream line rate changes on their service and any strategies they could adopt if they wish to shape downstream traffic in close relationship to the active line rate.

So you may be able to force the BRAS to re-evaluate the profile by terminating the PPP session for a minute or two then restarting.

You could do this by using the 'disconnect' function within the router then reconnect after a minute or so, or even unplug the router from the modem for a while then reconnect it to re-establish PPP.

[Edit to include more relevant info]

Edited by deleted (Sun 07-Sep-14 12:41:36)

Been though that loop many times - either directly or indirectly. Changed router, changed modem, routers reset to default and rebuilt ... The BT Techs - who spent three full afternoons on site could not resolve even when working with second line support and the product team (effectively third and fourth line).

It refers to a line re-train, so a modem disconnect, wait, power cycle and reconnect should be enough.

The mechanism is driven by PPP discovery, so disconnecting and reconnecting the PPP session should be enough. You should ask BT what the BRAS profile is set to.

In reply to a post by MHC:

It refers to a line re-train, so a modem disconnect, wait, power cycle and reconnect should be enough.

It seems to depend very much on how quickly an ISP's sytems react.

The HG612 usually resyncs in less than 20 seconds.

However, the IP Profile/BRAS rate is only ever updated when there has also been a PPP refresh.
That seems to be controlled by the ROUTER and/or the ISP.

I have quite a bit of evidence from my own & various other users' connections that they have ended up stuck on too high or too low an IP Profile/BRAS rate when their ISP's timers are out of sync.

Each time, disconnecting & reconnecting via the ROUTER has forced a new PPP session & the IP Profile, BRAS rate (& IP Address have been refreshed for those not using fixed IP Addresses).

Yes, tried a software disconnect, as well as hardware. Left it for minutes and tens of minutes last time.

Perhaps you have a stuck profile?

Plusnet have a few times in the past diagnosed an "imbalance" in the BT Wholesale system, whereby the IP Profile reported by the BT Wholesale Performance Test appears correct for the sync, but another copy of it seems to be held elsewhere as well and does the actual throughput limiting. I am not talking about the Plusnet copy of the IP Profile - in these cases that was in accord with the observed IP profile.

I wonder if that same location still sees you as a 10Mbps upstream product, even though the reported IP Profile is the expected 20Mbps?

Having the observed IP Profile correct didn't sort it out.

Edited by RobertoS (Sun 07-Sep-14 19:41:02)