Perle-systems 1700 Uživatelský manuál Strana 54

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Applications
48
Location: Main
ª Configuration
ª WAN Set-up
ª Remote Site Set-Up
ª Edit Remote Site
ª Protocol Set-Up
ª IP Set-up
ª NAT enabled
ª enabled
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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