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Author Topic: ZyXel VMG1312-B - should I go for it?  (Read 1387 times)

Weaver

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #15 on: April 09, 2017, 08:28:57 PM »

Stupid question, I just can't think of the answer though: could I use it without PPPoEoE, just set it up to do PPPoA on the DSL and then have it pass all IPv4 and IPv6 packets through straight? That would get rid of the PPPoEoE MTU 1492 problem. (If this is doable, I would totally need to redesign the Firebrick config somehow.)
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j0hn

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #16 on: April 09, 2017, 09:20:01 PM »

Just use PPPoA with 1500 MTU.
You can either have PPPoA with 1500 MTU or PPPoEoA with 1492 MTU.
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Weaver

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #17 on: April 09, 2017, 10:21:16 PM »

@john I have the luxury of MTU 1508 now with the DLink modems and PPPoEoE -> PPPoEoA because they and the router can both handle baby jumbo frames on the LAN, like the HG612 does.
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Weaver

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #18 on: April 09, 2017, 10:22:54 PM »

I have emailed AA sales to clarify whether or not they are B10A units that they are selling.
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Chrysalis

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #19 on: April 10, 2017, 12:17:28 AM »

Weaver yeah but if you use PPPOA you get native 1500 bytes mtu without a need to use jumbo frames.  PPPOA is a superior protocol to PPPOE.
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burakkucat

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #20 on: April 10, 2017, 12:19:23 AM »

I have emailed AA sales to clarify whether or not they are B10A units that they are selling.

From the image on their website, I can identify the devices as ZyXEL VMG1312-B10A.

Zen sell the ZyXEL VMG1312-B10D.

I purchased my -B10D from an eBay vendor as a brand-new, unused, Zen supplied unit, cost 40 and delivered to my local Argos store. All I needed to do was to clear the ROM-D (which removed all Zen customisations) and configure it appropriately for a G.993.2, ATM, VC-MUX 0/38, service.
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burakkucat

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #21 on: April 10, 2017, 12:29:17 AM »

. . . just set it up to do PPPoA on the DSL and then have it pass all IPv4 and IPv6 packets through straight?

Yes, yes, yes and - er - yes!  :)  That is what I thought you were doing. I now realise, from recent discussions, that you were "trapped in a historic era" (protocol-wise) through lack of knowledge/experience (??) of VC-MUX, 0/38 and were using LLC.

I know of a good informational web-site where LLC (old protcol) and VC-MUX are documented. Please don't ask me to provide an explicit URL as I would have to rummage and dig around . . .  :angel:
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burakkucat

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #22 on: April 10, 2017, 12:34:26 AM »

Please also have a read of this forum thread.
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Weaver

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #23 on: April 10, 2017, 03:22:43 AM »

@Chrysalis - Agreed, PPPoA is indeed far superior. For the one case of 1500-byte long IP packets, now I have woken up to the use of VC-MUX (having rid myself of the idea that it didn't work with BT and PPPoEoA), at least it is just the same as PPPoEoA VC-MUX anyway, because of ATM cell padding. But for many packet lengths, especially short ones, the difference is massive.

The thing is, it isn't quite so simple, the Firebrick may need the config options provided by the use of PPPoE interface objects, in order to define the upstream rate policing and it uses PPPoE I suspect to detect downed interfaces so that it can do failover - it will shift the traffic load seamlessless and very very quickly over to the remaining i/fs or fire up a failover interface such as a 4G USB dongle.

So I might be completely ruining all the reliability and load-balancing feature of the FB.

There's possibly a lot to lose just to get the MTU fixed. And after all, I never had the joy of MTU 1500 in recent years. I lost it when I gave up using an integrated modem-router with PPPoA (my beloved Netgear DG834 v3) and went to separate-box modems because unless you are using a Draytek Vigor you've had it for MTU 1508 on 20CN as I found out after I bought my first DLink modems having used ZyXel separate modems before that. So all during my 20CN days, while I had a separate modem, I was stuck with MTU 1492 PPPoEoA.

Make sense? I would need to ask RevK (with his Firebrick hat on) to confirm this.
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kitz

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #24 on: April 10, 2017, 11:29:31 AM »

@vic

Thanks - just noticed that had been there on the wiki since 2013 as the VMG1312-B  iirc the original 6368 info may have originally come from openwrt.   Im not certain as Ive only had a quick google,  but all info dating back to 2013 seems to just say 'B' without an extension.
   
The info on the modem routers thread (here) is and always has been correct.  I'll update the wiki in a min.
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kitz

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #25 on: April 10, 2017, 11:44:57 AM »

I have emailed AA sales to clarify whether or not they are B10A units that they are selling.

Yes its a B10A, as pointed out by b*cat they look very different. You can tell immediately by looking at whether its a flat (B10A)  or upright (B10D) modem.

I also picked up a brand new ex-Zen VMG1312-B10D on ebay for just 15 inc P&P.  I had to flash it with standard Zyxel f/w though before putting it on my connection.
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vic0239

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #26 on: April 10, 2017, 12:03:12 PM »

@kitz - no worries, a useful table which I hadn't actually seen before.  :)

@weaver - A&A may be able to supply the VMG1312-B10D too as they sent me a couple to try out during my PPPoE troubles.
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Weaver

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #27 on: April 10, 2017, 03:22:48 PM »

But just to double check - the B10A is the one I should be going for? (Asks rather belatedly.)
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vic0239

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #28 on: April 10, 2017, 03:29:45 PM »

The B10A certainly performs better than the B10D on my line so it would be my preference.
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kitz

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Re: ZyXel VMG1312-B - should I go for it?
« Reply #29 on: April 10, 2017, 10:59:57 PM »

But just to double check - the B10A is the one I should be going for? (Asks rather belatedly.)

Yes, but unfortunately its quite a bit more expensive.

Plus the caveat that what works best on some lines may not work best on others.
 
« Last Edit: April 10, 2017, 11:03:02 PM by kitz »
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