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MTU: Difference between revisions
Document some experimentation with baby jumbo frames on TTW
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(Document some experimentation with baby jumbo frames on TTW) |
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TTW's default MTU is 1492 bytes. It is possible to increase this to 1500 bytes by ticking 'TCPFix' with an MTU of '1500' on clueless. At the
time of writing (Dec 2014) TTW does not support an MTU of 1508, so users of PPPoE cannot achieve an MTU of more than 1492 bytes.
[Above is the official position. However there are some experimental results which indicate one might be able to do better. Using a TG582n as the router running PPPoE
and configuring it to support baby jumbo frames:
:eth ifconfig intf=eth_WAN mtu=1508
:ppp ifdetach intf=Internet
:ppp ifconfig intf=Internet mru=1500
:ppp ifattach intf=Internet
then PPP claims to successfully negotiate a 1500 octet MRU with TTW.
{Administrator}[ppp]=>:ppp iflist intf=Internet
Internet: dest eth_WAN [03:43:04] retry : 10
admin state = up oper state = up link state = connected
flags = echo magic accomp restart mru addr route savepwd ipv4 ipv6 chap
class = 12 echointerval = 10 echofail = 5 echototaltolerance = 50
'''administrative mru = 1500 negotiation mru = 1500'''
auth type = auto
...
Using the ping tests from above, a ping of 1468 octets (i.e. a payload of 1496) now works
but a ping of 1469 octets (payload of 1497) doesn't. So not quite 1500 octets, but getting
closer. This is despite the bridging modem not supporting an MTU > 1500 octets.
]
[[Category:Internet]] [[Category:Router]] [[Category:Configuring]][[Category:ADSL]]
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