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[MrMike]

Hello, apologies if this has been asked before. As the title says, does the ZyXel VMG8924-B10A support baby jumbo frames? I'm looking to bid on one to run in bridge mode connected to my Ubiquiti EdgeRouter, where I'll set the MTU on the PPPoE connection to 1500 and the MTU on eth0 to 1508. I'm currently using a Huawei HG612 in this way, but not impressed with the low upstream sync speeds when compared to my previous setup with the BT Smart Hub. Connected to an ECI cabinet and do not wish to spend over £70 on a Vigor 130.

[burakkucat]

As I can't give you a definite answer either way, I will suggest that you use the SEARCH function, above, with the string "baby jumbo frames" and check the 22 results found.

[highpriest]

Sadly, I don't think ZyXEL has added support for RFC4638 in any of their routers when run in bridge mode. AAISP did some tests on the VMG1312 and found this:

https://support.aa.net.uk/VMG1312-B10A:_Bugs

2016-10-24 Sadly (even though the hardware can support it) ZyXEL have told us that they will not be adding support for baby jumbo frames.

I have a very similar setup to yours and couldn't get it working with the ZyXEL in bridge mode. This was my config:

Code: [Select]

    ethernet eth1 {
        address 192.168.2.1/24
        description "Internet (PPPoE)"
        duplex auto
        mtu 1508
        poe {
            output off
        }
        pppoe 0 {
            default-route auto
            dhcpv6-pd {
                pd 0 {
                    interface switch0 {
                        host-address ::1
                        prefix-id :1
                        service slaac
                    }
                    prefix-length /48
                }
                rapid-commit enable
            }
            firewall {
                in {
                    ipv6-name WAN6_IN
                    name WAN_IN
                }
                local {
                    ipv6-name WAN6_LOCAL
                    name WAN_LOCAL
                }
            }
            ipv6 {
                address {
                    autoconf
                }
                dup-addr-detect-transmits 1
                enable {
                }
            }
            mtu 1500
            name-server auto
            password ****************
            user-id zenxxxxxx@zen
        }
        speed auto
    }

PPP negotiation succeeds for MTU of 1500...

Code: [Select]

Sun Feb  4 14:14:19 GMT 2018: Starting PPP daemon for pppoe0
Connected to 00:02:3b:10:93:ab via interface eth1
using channel 1
Using interface ppp0
Connect: ppp0 <--> eth1
sent [LCP ConfReq id=0x1 <magic 0x11fa7ec6>]
rcvd [LCP ConfReq id=0xf0 <mru 1500> <auth chap MD5> <magic 0x17561c72>]
lcp_reqci: returning CONFACK.
sent [LCP ConfAck id=0xf0 <mru 1500> <auth chap MD5> <magic 0x17561c72>]
rcvd [LCP ConfAck id=0x1 <magic 0x11fa7ec6>]
sent [LCP EchoReq id=0x0 magic=0x11fa7ec6]
rcvd [CHAP Challenge id=0x1 <b628a3793e3a149dd9adca2e69c68ae7>, name = "bng1.th-lon"]
sent [CHAP Response id=0x1 <db61f9a0a8962b20a6cc250cdcee92a4>, name = "zenxxxxxx@zen"]
rcvd [LCP EchoRep id=0x0 magic=0x17561c72]
rcvd [CHAP Success id=0x1 "CHAP authentication success, unit 18226"]
CHAP authentication succeeded: CHAP authentication success, unit 18226
CHAP authentication succeeded

But internet access goes all weird. Windows machines appeared to cope reasonably well but Apple devices were not happy at all. About half of all websites and the vast majority of apps stopped working on them.

My ISP (Zen) did some tests at their end and came to pretty much the same conclusion:

We've had a bit of a play and can only get the 8324 to support MTU of 1492 (+ 16 check bits). So, it doesn't look like it's going to work.

They are now sending me a TG589vac V2 to see if I can get it working on that device. I know the Vigor 130 supports it but I've had some bad experience with it in the past so not going to risk getting my line banded again (my cab is Huawei). Might have to dust off the HG612 if I can't get RFC4638 to work on the TG589vac V2.

Shame really as the VMG8324 is a really nice bit of kit. In bridge mode, it is a very stable modem.