OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version openwrt-18.06
  • Due in Version Undecided
  • Due Date Undecided
  • Votes
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Alec Robertson - 18.01.2019

FS#2062 - MTU is not set to 1508/1500 when using PPPoE

TP-LINK Archer C7, OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152).

Use PPPoE for WAN. Set MTU to 1508.

Observe ifconfig result. MTU is set at 1492, it should be 1500.

Add

config interface ‘eth0’

option ifname 'eth0'
option mtu '1508'

to /etc/config/network, ensure PPPoE MTU (as above) is set to 1508 and restart the network/reboot the router.

Observe ifconfig result. MTU is set at 1500 as expected.

Enrico commented on 05.02.2019 19:06

That's perfectly normal, openwrt automatically account for 8 byte of PPPoE overhead, thus 1500-8=1492.

If your ISP supports mini jumbo frames you could set MTU manually changing the MTU value on the pppoe interface.

Loading...

Available keyboard shortcuts

Tasklist

Task Details

Task Editing