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Standard User youngsyp
(committed) Wed 19-Sep-18 12:17:00
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VMG3925-B10B users


[link to this post]
 
Hi,

I've taken the option of the free ZyXel VMG3925-B10B gateway with my subscription and am curios to known who else uses this device on their line?

I'm currently using a Billion BiPAC 8800AXL R2, which is a great device with the coverted BCM6316* chipset onboard. Have any of you have compared the performance of a similar spec device (8800NL, ZyXel VMG8324/ 8924-B10A etc), with the VMG3925?

Cheers,

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
Standard User j0hn83
(experienced) Fri 21-Sep-18 01:43:42
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
which is a great device with the coverted BCM6316* chipset onboard.


BCM63167 isn't the same as the BCM63168 and synced some 2Mb lower on my line.

I've also never heard anyone praise the BCM6316*
I've seen hundreds praise the BCM63168, and some praise for the newer BCM63138 though.
I also regard the BCM63169 as a poorer chipset compared to the BCM63168.

Always avoid those with a 3 as the 3rd number, like the BCM63381. They are the Broadcom budget range.

The ZyXel VMG3925-B10B is an excellent device with a BCM63168 chipset.

It may have the extra common mode noise filter only found on some other ZyXEL models but I haven't seen a picture of the board to confirm this.
The ZyXel VMG3926-B10B definitely has it so I would assume the VMG3925-B10B does.

Edited by j0hn83 (Fri 21-Sep-18 01:44:31)

Standard User Banger
(eat-sleep-adslguide) Fri 21-Sep-18 01:49:04
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
I have tried the 3925 on my line and got a few meg less sync than a 1312-B10A so I keep it as a spare to replace my Asus router and not as a modem in a two device setup.

Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80/20 Meg Fibre
Speed Test

Current Sync: 79993/19661

BQM


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Standard User DanielCoffey67
(newbie) Fri 21-Sep-18 07:09:10
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
I have a 3925-B10B and am on a long rural line of about 3300m from the FTTC cabinet. I sync at pretty much exactly the same as my HH6 does (usually around 8650 / 1130).

I picked the 3925 on the advice of the folks at kitz and once flashed (and cracked for the supervisor password), I find it does its job on a long line perfectly.

I have it in Bridge mode of course with an ASUS RT-AC86U as router.

Edited by DanielCoffey67 (Fri 21-Sep-18 16:42:00)

Standard User youngsyp
(committed) Fri 21-Sep-18 13:40:32
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
which is a great device with the coverted BCM6316* chipset onboard.


BCM63167 isn't the same as the BCM63168 and synced some 2Mb lower on my line.

I've also never heard anyone praise the BCM6316*
I've seen hundreds praise the BCM63168, and some praise for the newer BCM63138 though.
I also regard the BCM63169 as a poorer chipset compared to the BCM63168.

Always avoid those with a 3 as the 3rd number, like the BCM63381. They are the Broadcom budget range.

The ZyXel VMG3925-B10B is an excellent device with a BCM63168 chipset.

It may have the extra common mode noise filter only found on some other ZyXEL models but I haven't seen a picture of the board to confirm this.
The ZyXel VMG3926-B10B definitely has it so I would assume the VMG3925-B10B does.
I've seen it stated that the 8800AXL R2 uses the BDCM63167 but I'm not convinced. I've used the ZyXel VMG8924-B10A and BiPAC 8800 AXL on my line, which both use the BDCM63168 chipset and the R2 syncs at exactly the same rates, actual and attainable (usual give and take aside). The R2 directly replaced the 8800 AXL actually.

As you've stated, the VMG3925-B10B does indeed use the BDCM63168, which I've realised since posting up this thread. For some reason, I was sure I read it used an inferior chipset and so gave lower syncs when compared to 63168 equipped modems.

I'll use my current 8800AXL R2 when I first get switched over and try the VMG3925 after a period of time and compare.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled

Edited by youngsyp (Fri 21-Sep-18 13:41:16)

Standard User youngsyp
(committed) Fri 21-Sep-18 13:42:44
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Re: VMG3925-B10B users


[re: DanielCoffey67] [link to this post]
 
In reply to a post by DanielCoffey67:
I have a 3925-B10B and am on a long rural line of about 3300m from the FTTC cabinet. I sync at pretty much exactly the same as my HH6 does (usually around 8650 / 1130).

I picked the 3925 on the advice of the folks at kitz and once flashed (and cracked for the supervisor password), I find it does its job on a long line perfectly.

I have it in Bridge mode of course with an ASUS RT-AC86U as router.
That suggests AA install their 'own' FW on the devices they supply?!

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
ISP Representative andrewhearn
(isp) Fri 21-Sep-18 14:33:05
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
It may have the extra common mode noise filter only found on some other ZyXEL models but I haven't seen a picture of the board to confirm this.


If it helps, we have a pic here: https://support.aa.net.uk/images/5/50/VMG3925-PCB-10...

Andrew Hearn
GM, AAISP
aa.net.uk support@aa.net.uk 033 33 400 999
The above post has been made by an ISP REPRESENTATIVE (although not necessarily the ISP being discussed in the post).
ISP Representative andrewhearn
(isp) Fri 21-Sep-18 14:35:44
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
In reply to a post by youngsyp:
In reply to a post by DanielCoffey67:
I have a 3925-B10B and am on a long rural line of about 3300m from the FTTC cabinet. I sync at pretty much exactly the same as my HH6 does (usually around 8650 / 1130).

I picked the 3925 on the advice of the folks at kitz and once flashed (and cracked for the supervisor password), I find it does its job on a long line perfectly.

I have it in Bridge mode of course with an ASUS RT-AC86U as router.
That suggests AA install their 'own' FW on the devices they supply?!

Paul


No, we don't.

Andrew Hearn
GM, AAISP
aa.net.uk support@aa.net.uk 033 33 400 999
The above post has been made by an ISP REPRESENTATIVE (although not necessarily the ISP being discussed in the post).
Standard User j0hn83
(experienced) Fri 21-Sep-18 14:52:15
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Re: VMG3925-B10B users


[re: andrewhearn] [link to this post]
 
To my eye that image doesn't have the noise filter.

Your AA page here states
It's believed that the VMG3925 has an extra common-mode noise filter on the telephone line. Kitz discussion


It then links to a discussion about 2 devices, that confirms a different device has the filter.

The VMG3926-B10A has the filter in but I'm not so sure the
VMG3925-B10B does unless they changed the shape/look of the filter.
kitz discussion

Edited by j0hn83 (Fri 21-Sep-18 15:21:23)

Standard User youngsyp
(committed) Fri 21-Sep-18 15:12:29
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Re: VMG3925-B10B users


[re: andrewhearn] [link to this post]
 
In reply to a post by andrewhearn:
No, we don't.
Thanks for the confirmation. The OP must have the same device from another ISP. Or I simply interpreted his comment wrongly.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
Standard User youngsyp
(committed) Fri 21-Sep-18 15:17:24
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
To my eye that image doesn't have the noise filter.

Your AA page here states
It's believed that the VMG3925 has an extra common-mode noise filter on the telephone line. Kitz discussion


It then links to a discussion about 2 devices, that confirms a different device has the filter.

The VMG3926-B10B has the filter in but I'm not so sure the
VMG3925-B10B does unless they changed the shape/look of the filter.
kitz discussion
I think you mean the VMG3926-B10A. I don't think there is a B10B variant.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
Standard User j0hn83
(experienced) Fri 21-Sep-18 15:23:04
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
Indeed.
Zyxel like to mix things up with the lettering.
My mistake though.
Standard User j0hn83
(experienced) Fri 21-Sep-18 16:14:01
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
In reply to a post by youngsyp:
In reply to a post by andrewhearn:
No, we don't.
Thanks for the confirmation. The OP must have the same device from another ISP. Or I simply interpreted his comment wrongly.

Paul


You interpreted his post incorrectly.
He's referring to obtaining the Supervisor password which is encrypted by default.

AAISP may also apply a Rom-D configuration file which applies automatic modifications to the firmware that may include things like TR-069.
The Rom-D would need cleared and the Supervisor pass would need cracked with hashcat to obtain full access to some relatively minor firmware settings.

That's very different from using their own firmware though and it leaves you free to update the firmware direct from Zyxel.
Standard User Zarjaz
(eat-sleep-adslguide) Fri 21-Sep-18 16:44:26
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Re: VMG3925-B10B users


[re: DanielCoffey67] [link to this post]
 
Are you saying you are achieving over 8 meg on FTTC at over 3 kilometres ?? That would seem quite remarkable good.

Standard User youngsyp
(committed) Fri 21-Sep-18 16:59:19
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
The Rom-D would need cleared and the Supervisor pass would need cracked with hashcat to obtain full access to some relatively minor firmware settings.
Thanks for the clarification.

Would the process you mentioned in the quote be that covered in this thread?

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
Standard User j0hn83
(experienced) Fri 21-Sep-18 17:45:17
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
No that's for a completely locked down modem that needs opening up and connecting directly to the circuit board.

This is the thread you need

Specifically, do the following:

1. Flash v13 firmware.

2. login as admin to telnet and use the command "zycli save_default clean" to remove the Rom-D

3. do a pin reset

4. login as admin again and run the command "cat /etc/passwd" to get the hashed (encrypted) Supervisor password.
It looks something like this:
supervisor:$1$EGkNsL/s$lVaYwb0.BCvNnESBkTSpH1:12:12:supervisor:/home/supervisor:/bin/sh

5. crack it, or message someone on that thread to crack it. I'm happy to do this for anyone. I'm j0hn on kitz.
Standard User youngsyp
(committed) Mon 24-Sep-18 12:18:49
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
No that's for a completely locked down modem that needs opening up and connecting directly to the circuit board.

This is the thread you need

Specifically, do the following:

1. Flash v13 firmware.

2. login as admin to telnet and use the command "zycli save_default clean" to remove the Rom-D

3. do a pin reset

4. login as admin again and run the command "cat /etc/passwd" to get the hashed (encrypted) Supervisor password.
It looks something like this:
supervisor:$1$EGkNsL/s$lVaYwb0.BCvNnESBkTSpH1:12:12:supervisor:/home/supervisor:/bin/sh

5. crack it, or message someone on that thread to crack it. I'm happy to do this for anyone. I'm j0hn on kitz.
Thanks for this, appreciate it.


I've just read this thread. Does the release of the FW linked in post #248 mean just uploading the FW negates the need to extract and crack the supervisor password?

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled
Standard User j0hn83
(experienced) Mon 24-Sep-18 12:44:05
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Re: VMG3925-B10B users


[re: youngsyp] [link to this post]
 
It does indeed.
Not a firmware I would install though.

I use the patched firmware to allow 1508 mtu and multiple telnet sessions but wouldn't install a firmware someone else made that overwrites the Supervisor password every minute till the end of time.
It does what it says on the tin but it's a very crass method imo.

It takes less than 15 minutes to crack the Supervisor password with a half decent GPU and then you can manually change it.
Standard User youngsyp
(committed) Mon 24-Sep-18 13:53:53
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
In reply to a post by j0hn83:
It does indeed.
Not a firmware I would install though.

I use the patched firmware to allow 1508 mtu and multiple telnet sessions but wouldn't install a firmware someone else made that overwrites the Supervisor password every minute till the end of time.
It does what it says on the tin but it's a very crass method imo.

It takes less than 15 minutes to crack the Supervisor password with a half decent GPU and then you can manually change it.
I'm certainly no expert on the subject but I agree with you. If I had the skills, it's certainly not how I'd do it.

To be honest, it's the ROM-D wiping that I'm interested in. I doubt I'd have any use for the configuration options requiring for the Supervisor password to access. It's a case of doing it because I can really.

Paul

ISP: IDNet
Service: FTTC Unlimited (55/10)
Exchange: EMSILVE
Cabinet: 4
DSLAM: Huawei
Modem/ router: Billion BiPAC 8800AXL
Attenuation: 21.7
Current sync: 55000/ 9875
G.INP: Enabled

Edited by youngsyp (Mon 24-Sep-18 13:54:28)

Standard User j0hn83
(experienced) Sat 29-Sep-18 23:05:51
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Re: VMG3925-B10B users


[re: andrewhearn] [link to this post]
 
Can someone correct the page here.

It's believed that the VMG3925 has an extra common-mode noise filter on the telephone line. Kitz discussion


The 3925-B10B definitely does NOT have the extra common-mode noise filter found in other ZyXEL models.
The 3926-B10A being discussed on the kitz thread has it.

A number of members of kitz have purchased the 3925 assuming it has the extra filter. The AA page is the only place that mentions this.
Standard User Banger
(eat-sleep-adslguide) Sun 30-Sep-18 00:08:05
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Re: VMG3925-B10B users


[re: j0hn83] [link to this post]
 
VMG-3926-B10A is a very rare beastie in the wild. smile

Tim
www.uno.net.uk & freenetname
Asus DSL-N55U and ZyXEL VMG1312-B10A Bridge on 80/20 Meg Fibre
Speed Test

Current Sync: 79993/19661

BQM
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