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Author Topic: Zyxel VMG8924-B10A 1508 MTU?  (Read 830 times)

StrifeLeonhart

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Zyxel VMG8924-B10A 1508 MTU?
« on: January 21, 2025, 03:13:04 AM »

Hi,

I have flashed my Zyxel VMG8924-B10A with johnson firmware https://github.com/johnson442/custom-zyxel-firmware/releases
the 8x24-B10A-28-jumbo-tel-x6-stats1.1-cmd to use the jumbo frames,

I just wanted to make sure that I'm putting the correct settings.

So the VMG8924-B10A in set in bridge mode and the Asus AXE11000 router behind it.

After that I go to the Asus WAN settings and set the MTU to 1500?
There is also an MRU setting underneath the MTU, do i leave that to 1492

Any help would be appreciated.
« Last Edit: January 21, 2025, 10:09:54 PM by StrifeLeonhart »
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LordSven

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #1 on: January 22, 2025, 05:32:21 PM »

No need to change anything on the 8924 once Johnson's firmware installed. 8924 Bridge mode in Broadband Settings. VLAN to 101 in modem.
PPPoE handled by Router. Modem will 1508 without intervention. SET ROUTER MTU to 1500. Worked for me. Incidentally, I have found the 3927 to have less upstream errors (ES) and 3MBs better DS sync than the 8924 on my short but noisy and poorly installed 265m BT FTTC line, but that can vary line by line as I'm sure that you know. I've an 8924, 3925, 3927 and a 1312 that I'm trying on 14day cycles at the moment after downgrading from G.fast due ££!
Edit: PPPoE by/from router and straight through modem for BT FTTC VDSL2, sorry for the previous assumption! I just took delivery of a VMG3926-B10A as well, nearly a full set to keep me going. Johnson's firmware is a real Godsend, as is this treasure trove of information that is Kitz.
« Last Edit: January 22, 2025, 07:24:44 PM by LordSven »
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BT FTTC 79/18 (running at 62/17 ish) from Huawei Cab - via Zyxel VMG9325-B10B - LordSven on MDWS via DslStats once upon a time.

StrifeLeonhart

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #2 on: January 24, 2025, 12:22:39 AM »

Thank you so much,

Unfortunately the Asus AXE11000 router does not support Jumbo frames.

Do you think I can use the XMG3927 as a router behind the VMG8924-B10A and use Jumbo frames if such thing is possible on the XMG3927?

Would you be able to tell me the serial number of your 1312 or at least the first few numbers, I would like to buy one from eBay but trying to find an old one because from what I can read here, there are new ones that have different firmware? I think they were called John Lewis if I'm not mistaken?
« Last Edit: January 24, 2025, 12:26:13 AM by StrifeLeonhart »
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tubaman

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #3 on: January 24, 2025, 07:58:08 AM »

What are you trying to achieve here as it seems a lot of effort and expense for the tiny gains that using MTU 1500 rather than 1492 will give you?
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BT FTTC 55/10 Huawei Cab - Zyxel VMG8924-B10A

perlen

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #4 on: January 24, 2025, 06:27:29 PM »

The Merlin firmware should allow 1500 selection:
https://www.asuswrt-merlin.net/

StrifeLeonhart

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #5 on: January 25, 2025, 06:12:42 AM »

What are you trying to achieve here as it seems a lot of effort and expense for the tiny gains that using MTU 1500 rather than 1492 will give you?
Personally I like to experiment in networking even if the gains are minimum, that being said if the experiments require tiny amount of money to spend than I don't mind doing that.

The Merlin firmware should allow 1500 selection:
https://www.asuswrt-merlin.net/

That's also what I'm using at the moment on the Asus AXE11000 Router, when I tried to set it to 1500 and tested with ping command it didn't work. But it seems to be Router specific for some reason, the ones tested by some people and worked are the ASUS RT-AC86U and the RT-AC3100.
« Last Edit: January 25, 2025, 06:18:11 AM by StrifeLeonhart »
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perlen

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #6 on: January 25, 2025, 06:34:01 PM »

Can you type in or select 1508?

StrifeLeonhart

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #7 on: January 27, 2025, 09:48:11 AM »

Can you type in or select 1508?
I have to Type it in, but anything above 1500 will result in popup saying MAX is 1500!
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hushcoden

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #8 on: January 27, 2025, 06:59:24 PM »

If you SSH into the Asus router and issue ifconfig WAN_interface - what MTU do you see? 1492?

What happens if you try to change it manually?
ifconfig WAN_interface mtu 1508 up
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StrifeLeonhart

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #9 on: February 02, 2025, 02:27:31 AM »

If you SSH into the Asus router and issue ifconfig WAN_interface - what MTU do you see? 1492?

What happens if you try to change it manually?
ifconfig WAN_interface mtu 1508 up
Im using Merlin Firmware, and I think the correct command is "ifconfig eth0" since that's the WAN port on the router

and when I use it, it does indeed show MTU1500.

and I also tried "ifconfig WAN_interface mtu 1508 up" does not work
tried "ifconfig eth0 mtu 1508 up" and says: ifconfig: SIOCSIFMTU: Invalid argument
« Last Edit: February 02, 2025, 08:08:52 AM by StrifeLeonhart »
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hushcoden

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Re: Zyxel VMG8924-B10A 1508 MTU?
« Reply #10 on: February 12, 2025, 09:08:52 AM »

You have to put the actual WAN_interface name, pppe0 or whatever its name is...
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