Posted: Sat Mar 31, 2018 20:19 Post subject: Changing mtu to 1508
Hi, i cannot change on web gui so I’ve ssh into router and ran ifconfig ppp0 mtu 1508, I then lose internet connectivity, could some please help. Running r7800 with Kong build. R35550M
Thanks
Most ISPs in the UK support something called a baby jumbo frame. They have adopted the standard RFC4638 which allows for an MTU bigger than the normal maximum of 1500 bytes, specifically they've allowed for a 1508 byte MTU.
This means that your router can use a 1500 byte MTU for your connection and still have space for 8 bytes for the PPP session which takes you to the 1508 baby jumbo frame.
But I’m unable to change this, any ideas? My modem supports mtu 1520, it has worked using OpenWrt .
Joined: 16 Nov 2015 Posts: 6437 Location: UK, London, just across the river..
Posted: Mon Apr 02, 2018 6:41 Post subject:
yep 1508MTU is modem supported, but not dd-wrt supported,
i use BT and Plus and they stick to 1492 MTU for pppoe
not much point to use it as many devices do not support more over 1500 MTU... _________________ Atheros
TP-Link WR740Nv1 ---DD-WRT 55630 WAP
TP-Link WR1043NDv2 -DD-WRT 55723 Gateway/DoT,Forced DNS,Ad-Block,Firewall,x4VLAN,VPN
TP-Link WR1043NDv2 -Gargoyle OS 1.15.x AP,DNS,QoS,Quotas
Qualcomm-Atheros
Netgear XR500 --DD-WRT 55779 Gateway/DoH,Forced DNS,AP Isolation,4VLAN,Ad-Block,Firewall,Vanilla
Netgear R7800 --DD-WRT 55819 Gateway/DoT,AD-Block,Forced DNS,AP&Net Isolation,x3VLAN,Firewall,Vanilla
Netgear R9000 --DD-WRT 55779 Gateway/DoT,AD-Block,AP Isolation,Firewall,Forced DNS,x2VLAN,Vanilla
Broadcom
Netgear R7000 --DD-WRT 55460 Gateway/SmartDNS/DoH,AD-Block,Firewall,Forced DNS,x3VLAN,VPN
NOT USING 5Ghz ANYWHERE
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