Motorola NVG510 User Manual download pdf (Page 4)

VPN and AT&T U-verse

When using VPN across the AT&T U-verse platform it is often necessary to

lower the MTU (Maximum Transmitable Unit) setting of the VPN client or if using a VPN appliance /

concentrator then the egress port to the AT&T U-verse RG to 1472. Common

symptoms of MTU needing to be lowered would be VPN connections not

being stable or having very poor performance for applications and browsing

that traverses the VPN.

Often lowering the MTU on your end alone will correct this, sometimes it

may additionally require adjustment on the far end as well.

Also a note on the Motorola NVG510 – VPN connections using PPPTP or

L2TP will require setting up the GRE ALG option (or PPTP etc) in the

NAT/Gaming section.

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Motorola NVG510 User Manual Page 4