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[GigabitEthernet]

I've got the Huawei HG612 connected today, in bridge mode, connected to a TP-LINK Archer C7 running OpenWRT.

With the MTU on the C7 set to 1500, the largest packet without fragmentation I can send is 1472 bytes.

TalkTalk uses IPoE and so the overhead of PPPoE does not apply. There is a 4 byte overhead added by Openreach to each packet (http://www.btplc.com/sinet/SINs/pdf/498v7p1.pdf) too.

What should my MTU be set to; Is 1500 correct?

[Dray]

What happens if you set the MTU on the router to 1534 then run this test?  http://www.tp-link.us/article/?faqid=190

[Weaver]

I've used the following test before, would this be of any use to you ?
     http://www.letmecheck.it/mtu-test.php

[niemand]

ICMP has a 28 byte overhead. The packet size you specify doesn't include this. You have a 1500 byte MTU.

[NewtronStar]

Would just set the modem to 1492 and on the PC side to 1492 the overhead will take this to a MTU setting of 1500 though modems will complain in its logs the MTU could not be set to 1500,

Yet when I look at my ISP modem settings it states that the MTU should be set at 1492

[niemand]

TalkTalk don't use PPP for their own FTTC subscribers so no need for the extra 8 bytes of headroom. Per my post above OP has an MTU of 1500 which is correct for TalkTalk Fibre.

[Chrysalis]

They use DHCP like sky?

[jid]

They use DHCP like sky?

Correct

[NewtronStar]

Correct

Correct