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Author Topic: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)  (Read 30291 times)

highpriest

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Zen | Zyxel VMG8324-B10A (with RFC4638 patch) | EdgeRouter PoE | UniFi AP AC Pro + Lite

Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #301 on: March 15, 2019, 09:57:15 PM »

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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #302 on: March 16, 2019, 12:52:59 AM »

I think it is true. Itís only 20CN THAT has a problem as far as I know, but I couldnít say for all random LLU systems. I think FTTC is always fine.
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Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #303 on: March 16, 2019, 01:19:12 AM »

I think it is true. Itís only 20CN THAT has a problem as far as I know, but I couldnít say for all random LLU systems. I think FTTC is always fine.

It may have changed but the last time I was on Origin Broadband they didn't support it.
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #304 on: March 16, 2019, 10:43:46 AM »

The OpenReach NGA network (FTTC/P, G.Fast) supports RFC4638 and I believe it has since launch.

AFAIK digital region did not support RFC4638. So if you were with Origin with Digital Region then that may have been the issue.
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Plusnet FTTC 80/20 -  ECI now Huawei cab
retx low @ 3dB target SNRM
Zyxel VMG1312-B10A bridged with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #305 on: March 16, 2019, 04:02:14 PM »

The OpenReach NGA network (FTTC/P, G.Fast) supports RFC4638 and I believe it has since launch.

AFAIK digital region did not support RFC4638. So if you were with Origin with Digital Region then that may have been the issue.

No this was Origin once they were on BT and had changed networks a few times.  I always assumed it was due to their legacy of coming from Digital Region so their kit was never configured for it.
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #306 on: March 23, 2019, 01:39:16 AM »

A new version of the VMG3925-B10B firmware is now up on:

https://github.com/trejan/VMG3925-B10B

This contains (i) the jumbo frames patch; and (ii) a mechanism to sync the admin user password to supervisor + root.

Wait, so should I be able to login as supervisor with my admin password on the pre-compiled binary image or am I misunderstanding something?
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

jhm

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #307 on: March 23, 2019, 06:40:55 AM »

Wait, so should I be able to login as supervisor with my admin password on the pre-compiled binary image ...

Yes, exactly!

Quote
The supervisor and root passwords are reset every startup by a big closed source Zyxel shared library (/lib/private/libzcfg_be.so) that handles all of the initialisation and configuration tasks in this router. The library calculates a new root + supervisor password based on the serial number or MAC address with an unknown algorithm. There is now a cronjob that will sync the admin user password to the root + supervisor accounts every minute. Don't try to directly change the root or supervisor account passwords as they will get overwritten.
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Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #308 on: March 23, 2019, 10:37:25 AM »

Yes, exactly!

Strange, its not working here from telnet, SSH or UI.

Is this applied to both firmware images?  I used the latest one with the new UI as I don't intend to use the UI enough for a few bugs to be a problem.
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

jhm

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #309 on: March 23, 2019, 12:54:12 PM »

Strange, its not working here from telnet, SSH or UI.

I just tried it here on both of mine and they both work - logging in as supervisor (using the admin password) on both the UI and SSH, e.g.

Quote
$ ssh supervisor@192.168.1.2
supervisor@192.168.1.2's password:


BusyBox v1.20.1 (2019-01-29 02:40:42 GMT) built-in shell (ash)
Enter 'help' for a list of built-in commands.

$ exit
Connection to 192.168.1.2 closed.

Quote
Is this applied to both firmware images?  I used the latest one with the new UI as I don't intend to use the UI enough for a few bugs to be a problem.

By both firmware images, do you mean those on the Github releases page - V5.13AAVF.12C0-jumbo.bin and V5.13AAVF.11C0-jumbo.bin?  From memory, it's applied to both but definitely it's applied to the most recent one.
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Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #310 on: March 23, 2019, 06:52:22 PM »

V5.13AAVF.12C0-jumbo.bin
Code: [Select]
# ssh supervisor@192.168.10.1
The authenticity of host '192.168.10.1 (192.168.10.1)' can't be established.
RSA key fingerprint is SHA256:DVk0QzNvcY2eXnZVCmtx2oZ0h1tmc0qdeChMmmvH+oI.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.10.1' (RSA) to the list of known hosts.
supervisor@192.168.10.1's password:
Permission denied, please try again.
supervisor@192.168.10.1's password:
Permission denied, please try again.
supervisor@192.168.10.1's password:
supervisor@192.168.10.1: Permission denied (publickey,password).
[root@God ~]# ssh admin@192.168.10.1
admin@192.168.10.1's password:
No entry for terminal type "xterm-256color";
using dumb terminal settings.
ZySH>
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

jhm

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #311 on: March 23, 2019, 08:45:36 PM »

I don't know what's wrong but:

1  (sorry if this is obvious - just checking) does the new firmware otherwise work, i.e. baby jumbo frames are supported now ?

2  if yes to the above, maybe you can change your admin password, wait two minutes (the cronjob runs every minute) and then try logging in again as admin and supervisor using that password?
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Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #312 on: March 23, 2019, 09:04:24 PM »

I don't know what's wrong but:

1  (sorry if this is obvious - just checking) does the new firmware otherwise work, i.e. baby jumbo frames are supported now ?

2  if yes to the above, maybe you can change your admin password, wait two minutes (the cronjob runs every minute) and then try logging in again as admin and supervisor using that password?

1. Yes, baby jumbo works perfectly.

2. You make a good point. I wonder if its glitching because I set the password BEFORE updating the firmware?  Will try now.
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

Alex Atkin UK

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #313 on: March 23, 2019, 10:22:27 PM »

Nope, tried changing it back to the same password then after an hour that didn't work so changed it to something else, still doesn't work.  :no:
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Modems: 2 x VMG3925-B10B V5.13(AAVF.12)C0-jumbo
Router: i5-7200U appliance running pfSense.
ISP: Zen Unlimited Fibre 2 + Plusnet Unlimited Fibre Extra.

jhm

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #314 on: March 23, 2019, 10:39:59 PM »

Nope, tried changing it back to the same password then after an hour that didn't work so changed it to something else, still doesn't work.  :no:

Hmmm, I'm confused now.  I looked at the changes to the stock Zyxel distribution on Github and I can't see (anymore?) the change which syncs the passwords.  I will ask my brother (who put it up on Github).
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