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[hushcoden]

I've just got an FTTP connection (Zen/Openreach = PPPoE)) and I was trying to understand if I could set the MTU to 1508 somehow...

I'm using OPNsense connected to the ONT (Zyxel PM5313-00) and I don't believe I have access to its webGUI, do I? Or would I just configure OPNsense ?

Any advice is more than welcome.

Tia.

[dee.jay]

This isn't a setting on the ONT - it's all in OPNsense.

[Chrysalis]

I asked this question before I first got FTTP, and I will reply with the response I got, basically ONT's are pre configured to support baby jumbo frames, so you should just be able to configure 1500 bytes on your router and expect it to work.

[dee.jay]

I asked this question before I first got FTTP, and I will reply with the response I got, basically ONT's are pre configured to support baby jumbo frames, so you should just be able to configure 1500 bytes on your router and expect it to work.

You'd need 1508 on your WAN interface if PPPoE is involved though.

[Chrysalis]

You'd need 1508 on your WAN interface if PPPoE is involved though.

I didnt need to do any of that, just dialled in 1500.  But on VDSL I had to manually set 1508 on the modem.

[hushcoden]

I found an how-to here, so I will give it a try

Thanks.

[Alex Atkin UK]

I didnt need to do any of that, just dialled in 1500.  But on VDSL I had to manually set 1508 on the modem.

I believe pfSense adjusts the physical interface setting automagically if you set 1500 for PPPoE.  Wouldn't be surprised if OPNsense does too.

[Chrysalis]

I believe pfSense adjusts the physical interface setting automagically if you set 1500 for PPPoE.  Wouldn't be surprised if OPNsense does too.

It does yep, so to clear up what I meant, on VDSL I had to (or rather on the zyxel someone had to make a custom firmware that defaults it to MTU 1508).  This step doesnt seem enecessary on FTTP, as ONT support it out of the box.

But of course as you said the physical interface on the firewall still needs to be 1508 and pfSense will automate that now when you configure 1500 on the PPPoE interface.  Thats why, thats all I had to do, ONT already compatible and pfSense handling its own side automatically.