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Author Topic: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)  (Read 6975 times)

j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #90 on: May 12, 2018, 03:45:00 PM »

Can this be changed? Don't think so.
Maybe I could upload a configuration file with 1492 edited to 1500, but I won't try that for now.
Next time take the time to test something before you pretend to know it for sure.

I think johnson's confusion comes from the fact that when used in modem/router mode there is no need for the special jumbo frames firmware.
The "ifconfig ptm0 mtu 1508" + "ifconfig ptm0.1 mtu 1508" commands just work. Yes it's not permanent, but it works without having to install any special firmware.
So I recommend you install the standard AAJZ.14 from Zyxel.

In bridge mode sending the "ifconfig ptm0 mtu 1508" command doesn't work right, even when using a router that supports 1508 MTU (Baby Jumbo Frames).
The firmware is a complete fix when used with a router that supports 1508 MTU.
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Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #91 on: May 12, 2018, 04:26:41 PM »

I still have hope in editing the configuration file so I'll keep using this firmware, but I don't know which entry there would be the wan mtu?

And a side question, does AAJZ.14 sync the best for you guys? Or you've had a better experience with an older firmware?
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #92 on: May 12, 2018, 04:38:58 PM »

The only "configuration.conf" I have from a VMG1312 was already in bridge mode, and a quick search of it has no hits for "MTU" "1492" or "1500". But this maybe due to no section for a normal PPPoE based connection. Have a look through one from your current setup.

As for the best syncing firmware, the latest is probably best but... I had a go with a really old one recently to see if it fixed an unrelated problem and it synced the highest I have seen, with the caveat that it had much higher errors and disconnected several times in the few days I used it. This may be no problem if you have a more stable line than mine (its garbage). Was the AAJZ.7 from ftp://ftp2.zyxel.com/VMG1312-B10A/firmware/.

Pinch of salt and all that, but it gave me a few Mbits more download sync.
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burakkucat

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #93 on: May 12, 2018, 04:47:46 PM »

Perhaps the following image will convince you that the default maximum MTU size, settable via the GUI, for modem/router mode of a ZyXEL VMG1312-B10A (purchased in the U.K. and with no ISP/CP customisation) is 1500.



I have two units. Both are identical.  :)

Edited to add the lines grep'd from the saved configuration files --

[Duo2 ZyXEL_VMG1312-B10A]$ grep MaxMTUSize config*txt
configuration-backupsettings_20180408-2200.txt:          <X_404A03_MaxMTUSize>1500</X_404A03_MaxMTUSize>
configuration-backupsettings_20180414-2114.txt:          <X_404A03_MaxMTUSize>1500</X_404A03_MaxMTUSize>
[Duo2 ZyXEL_VMG1312-B10A]$
« Last Edit: May 12, 2018, 04:56:03 PM by burakkucat »
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j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #94 on: May 12, 2018, 04:49:09 PM »

Under Maintenance > Configuration

backup your current config
find the line...

Quote
<X_404A03_MaxMTUSize>1492</X_404A03_MaxMTUSize>

try change it to

Quote
<X_404A03_MaxMTUSize>1500</X_404A03_MaxMTUSize>

Restore the edited .conf

report back here?
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #95 on: May 12, 2018, 04:50:41 PM »

I'm thinking maybe the difference is your ADSL connection burakkucat?
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j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #96 on: May 12, 2018, 04:52:21 PM »

He's Talktalk
They use IPoe
PPPoe is 1492 max
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BT FTTC 55/10 ECI now Huawei cab
Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

burakkucat

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #97 on: May 12, 2018, 05:01:14 PM »

I'm thinking maybe the difference is your ADSL connection burakkucat?

He's Talktalk
They use IPoe
PPPoe is 1492 max

Sorry but neither suggestions have any relevance to the fact that two separate VMG1312-B10A have been configured from the GUI and the upper limit of the MTU offered -- and accepted -- is 1500.
« Last Edit: May 12, 2018, 05:04:02 PM by burakkucat »
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #98 on: May 12, 2018, 05:06:09 PM »

Sorry but neither suggestions have any relevance to the fact that two separate VMG1312-B10A have been configured from the GUI and the upper limit of the MTU offered -- and accepted -- is 1500.

The limit is 1492 for me (PPPoE). Anyway I'll try the configuration file and edit this post.

Edit: I can't find MTU or 1492, maybe if I reset the configuration to how AAJZ.14 makes it [previously used .11]. Maybe I need to edit it from the default 1492 to a different value for it to show up?

Edit2: Okay I edited it to 1491 in the web interface and it showed up. I'll try changing it to 1500.

Edit3: Boots up the interface at 1492 despite the configuration file at 1500. And web interface shows 1492. Guess I'll switch to the official firmware soon.

As for the best syncing firmware, the latest is probably best but... I had a go with a really old one recently to see if it fixed an unrelated problem and it synced the highest I have seen, with the caveat that it had much higher errors and disconnected several times in the few days I used it. This may be no problem if you have a more stable line than mine (its garbage). Was the AAJZ.7 from ftp://ftp2.zyxel.com/VMG1312-B10A/firmware/.

Pinch of salt and all that, but it gave me a few Mbits more download sync.
Would it have any effect if I have a fixed rate line?
« Last Edit: May 12, 2018, 05:51:50 PM by spring »
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #99 on: May 12, 2018, 05:06:27 PM »

What if you choose PPPoE as the connection type and then try an MTU over 1492?
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #100 on: May 12, 2018, 06:20:49 PM »

Would it have any effect if I have a fixed rate line?

Fixed as in banded? Or you are already at the max sync of your package? Either way I doubt it.
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #101 on: May 12, 2018, 07:03:45 PM »

Fixed as in banded? Or you are already at the max sync of your package? Either way I doubt it.
Constant sync rate, and yes I'm at the max sync.

Would be good to see if you set the wan mtu to 1500 with cfg file and then change the ptm interfaces back to 1500 if packets get fragmented. That way we'd know if its just the nag from the web interface that needs to be circumvented and no need for the other changes when running as a modem/router.
Tried that earlier today, WAN connection was up but internet didn't work at 1500 nor set back to 1508, so I restarted the router. Seems this custom firmware is "locked" at 1508. So I conclude it probably must be 1508 for baby jumbo frames to work.
« Last Edit: May 12, 2018, 08:04:05 PM by spring »
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underzone

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #102 on: May 16, 2018, 03:44:36 PM »

Just installed the pre-compiled Olipro firmware for fun on a spare VMG1312-B10A. In bridge mode jumbo frames are working well:

$ ping -M do -c 4 -s 1472  1.1.1.1
PING 1.1.1.1 (1.1.1.1) 1472(1500) bytes of data.
1480 bytes from 1.1.1.1: icmp_seq=1 ttl=57 time=10.9 ms
1480 bytes from 1.1.1.1: icmp_seq=2 ttl=57 time=10.5 ms
1480 bytes from 1.1.1.1: icmp_seq=3 ttl=57 time=10.5 ms
1480 bytes from 1.1.1.1: icmp_seq=4 ttl=57 time=10.3 ms

Bump the packet length up to 1473 and as expected:

$ ping -M do -c 4 -s 1473  1.1.1.1
PING 1.1.1.1 (1.1.1.1) 1473(1501) bytes of data.
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500
ping: local error: Message too long, mtu=1500


The Zxyel VMG1312-B10A is also working fine with BT multicast TV, IPTV (again, in bridge/modem mode and then fed into a pfsense box).
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BT Infinity 2,  ECI PCP,  Zyxel VMG1312-B10A (bridge mode),  pfSense 2.4.3

j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #103 on: May 17, 2018, 09:34:24 PM »

I've made a firmware for the VMG8924-B10A if anyone wants it. Based on the latest 1.00(AAKL.21)C0

http://bit.ly/8x24Jumbo
« Last Edit: May 17, 2018, 09:55:12 PM by j0hn »
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Zyxel VMG1312-B10A bridge mode with 1508 MTU + Asus RT-AC68U running Asuswrt-Merlin

johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #104 on: May 18, 2018, 06:31:31 AM »

Replaced AAJZ.11 with this custom AAJZ.14, didn't reconfigure, sent "ifconfig ppp2.1 mtu 1500" in telnet and didn't notice a problem for the past 2 days (modem-router mode).

But, it only lasts for the PPP session, and next session reverts back to 1492.

I don't know what can be done as I'm clueless about these things.

Spring are you sure you were getting 1500 byte packets through to every site? I'm just looking through the source to find what needs to be changed to allow saved 1508 mtu in modem/router mode and there are several hard coded limits to 1492 when using PPPoE in pppd itself.

From earlier in this thread you can see that before modification setting 1508 mtu appeared to work, but somehow the fragmentation was being masked.

Can you try a fragmentation test to cloudflare.com with your current setup?
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