Therefore max PPPoE MRU and MTU values must not be larger than 1492. TCP stacks try to avoid fragmentation, so they use an MSS (Maximum Segment Size). By default, MSS is chosen as MTU of the outgoing interface minus the usual size of the TCP and IP headers (40 bytes), which results in 1460 bytes for an Ethernet interface.
O MTU máximo de uma relação dependerá da plataforma de hardware, mas a IEEE 802.3 padrões exige um mínimo MTU de 1500 bytes. O PPPoE precisa 8 bytes adicionais e trunca os Ethernet MTU a 1492, e se o MTU eficaz nos anfitriões não é mudado, o roteador entre o host e o server podem terminar as sessões de TCP. Windows machines from visa on will auto determine the MTU and would match the router setting. @Oldjim For what it's worth: Plusnet TG582n router will by default use a MTU of 1492 when configured for pppoe (fibre). When configured for ADSL it defaults to a MTU of 1500. Don't know about the 2704n. Jan 04, 2019 · The smallest one of them is used as the negotiated MTU. If a Config-Request packet does not carry an MRU field in the LCP negotiation stage. If the PPP_MRU_Max is not negotiated in the PPPoE discovery stage, the smallest one of 1492 , the MTU of the bas interface and the VT MTU is used as the negotiated MTU. To figure out the MSS you want, you take the standard 1500 MTU and subtract the PPPoE header, the IP header, and the TCP header (20 bytes 3): 1500 - 8 - 20 - 20 = 1452. EdgeRouter If you have an EdgeRouter, you'll want the following configuration options to set the MTU for your PPPoE connection and MSS clamping, where eth0 is the interface you Jul 22, 2018 · Certamente se você usa PPPoE já teve a dúvida de saber qual o melhor MTU para colocar nos seus clientes, se é 1492, 1480, 1452 Veja nesse vídeo exatamente a diferença desses MTU, o que PPPoE v2: 1492: Ethernet II MTU (1500) less PPPoE header (8) DS-Lite over PPPoE 1452 Ethernet II MTU (1500) less PPPoE header (8) and IPv6 header (40) PPPoE jumbo frames 1493 – 9190 or more: Ethernet Jumbo Frame MTU (1501 - 9198) less PPPoE header (8) IEEE 802.11 Wi-Fi (WLAN) 2304: The maximum MSDU size is 2304 before encryption. WEP will add
To figure out the MSS you want, you take the standard 1500 MTU and subtract the PPPoE header, the IP header, and the TCP header (20 bytes 3): 1500 - 8 - 20 - 20 = 1452. EdgeRouter If you have an EdgeRouter, you'll want the following configuration options to set the MTU for your PPPoE connection and MSS clamping, where eth0 is the interface you
In some cases, verifying the configuration of the following parameters may improve the performance of the PPPoE connection: MTU Size (1492 bytes max) – A mismatch of MTU size between PPPoE server and client can result is smaller than optimal packets, causing throughput issues and unnecessary fragmentation of packets. Apr 17, 2018 · However, it took us a while to get it set up and we did need to get a little help from CenturyLink to get the PPPoE password. Afterward we simply added the VLAN ID and changed the priority, as well as setting the IPv6 configuration and changing the MTU size to match CenturyLink specs. So far performance has been good based on speed tests. IP MTU: Click the Advanced tab, and In the IP MTU field, ensure that the IP MTU is at least 8 bytes less than the MTU on the physical interface. The maximum MTU for a PPP interface is 1492 bytes. If the PPPoE server does not specify a maximum receive unit (MRU), the MTU value for the PPP interface is used as the MRU. Save
Windows machines from visa on will auto determine the MTU and would match the router setting. @Oldjim For what it's worth: Plusnet TG582n router will by default use a MTU of 1492 when configured for pppoe (fibre). When configured for ADSL it defaults to a MTU of 1500. Don't know about the 2704n.
Jan 04, 2019 · The smallest one of them is used as the negotiated MTU. If a Config-Request packet does not carry an MRU field in the LCP negotiation stage. If the PPP_MRU_Max is not negotiated in the PPPoE discovery stage, the smallest one of 1492 , the MTU of the bas interface and the VT MTU is used as the negotiated MTU.