Perle Systems 1700 manual ªTCP mss value ª1452

Applications

Location: Main

ªConfiguration

ªWAN Set-up

ªRemote Site Set-Up

ªEdit Remote Site

ªProtocol Set-Up

ªIP Set-up

ªNAT enabled

ªenabled

Access to some web pages is a common problem experienced when running a PPPoE client on a router. By design, PPPoE packets can support a maximum MTU of up 1492 bytes. Normally when a connection is established over common PPP, the TCP protocol negotiates its maximum data size using the mss option (default 1460). By default, most Windows PCs have their TCP mss option set to 1460 bytes. Since PPPoE requires an additional 8 bytes of header data, the TCP mss option should decrease to 1452 bytes. Therefore when configuring the router for PPPoE, the remote site NAT configuration automatically adjust its TCP mss option to 1452 to accommodate this requirement. To verify this value has been adjusted:

Location: Main

ªConfiguration

ªWAN Set-Up

ªRemote Site Set-up

ªProtocol Set-Up

ªIP Parameters

ªNAT Advanced Set-up

ªTCP mss

ªenabled

ªTCP mss value ª1452

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