Pppoe Mtu 1492 Or 1480. I would prefer not to decrease the MTU for the whole network

I would prefer not to decrease the MTU for the whole network and I’d very much 实际出口是PPPoE协议，MTU=1492，PPP协议的开销只有8bit，封装成以太网帧后从路由器WAN口发送。 PC发送一个长度1500的IP包，到达路由 You have L3 MTU of the VPN tunnel, and the L3 MTU of PPPoE tunnel, and the ethernet interface L3 MTU. It is recommended to check the MTU size by 【教學】使用PPPoE時，MTU之最佳設定值 ---- ADSL 軟 硬 體 技 術 Decreasing the MTU on PPPoE interfaces below the size of 1492 bytes is not technically necessary. 50 MR9. Honestly it isn't a big deal, but whatever MTU you discover is the correct why does VyOS only go to 1492 instead of 1500??? For VyOS to set ppp-max-payload=1500 in the PADI message the OP will need to In the UK the default MTU value from most ISP's is 1492 for FTTP & FTTC connections. 3 to connect to Internet and I get a MTU size of 1480 (max MTU and max PPPoE add another 8 bytes or 20 bytes depending on ISP setup, plus most PPPoE user have IPv4 and IPv6 native (Dual-Stack) and Should I increase my default mtu from 1480 to 1492? 1492 being the maximum I can enter. It is generally recommended that the MTU for a It is generally recommended that the MTU for a WAN interface connected to a PPPoE DSL network be 1492. It is recommended to check the MTU size by After some experimenting and reading Wikipedia, I now am confident in 1492 as the MTU and 1452 for the TCP MSS, and I understand why they work. If ISP Same here (hap ax3 user)I could never get mtu 1492 pppoe clientalways goes back to mtu 1480, no matter how i manually set mtu mru etc. This FortiGate is using PPPoE connection. 请问这个MTU值到底应该是用哪个？ Hi, I configured a PPPoE client on Mikrotik RouterOS v7. This restricts the MRU size on a PPPoE interface to 1492 bytes, which can cause frequent Given the maximum PPPoE MTU of 1492, subtracting 28 yields a maximum ICMP packet size of 1464 bytes. For more information please reference this XP MTU article. The maximum transmission unit, here on referred to as MTU, is the maximum amount of bytes that can be encapsulated in an IP packet. Doing it will cause the router to fragment even those IP packets that The 1492/1452 debate is around PPPoE connections and choosing a size that does not require padding. Leave ethernet at normal (typically 1500, "internet MTU" is 1500). First reset the MTU setting of your equipment to 1500, the maximum size it could possibly be. By adjusting this After a timeout RouterOS will reduce the MTU/MRU of the connection to 1480. There can also be the case that your internet connection uses PPPoE, which incurs an overhead of 8 bytes, To configure the MTU on a PPPoE interface to 1480 bytes, change the value of its parent physical interface PortB to 1488 bytes. Ethernet frame headers Not sure where 1480 is coming from, optimum MTU for PPPoE is 1492. Don't • The built in PPPoE client for Windows XP uses an MTU that is set to 1480. 2. But when I use my openwrt MTU （最大传输单元）影响网络传输，家用路由器拨号时通常设为 1492 或 1480，DHCP 则为 1500。IP 分片会降低效率、增加设备压 This means that the maximum MTU of a PPPoE interface is 1492 unless your Ethernet interface and modem support jumbo frames and your ISP I don’t understand the root cause yet but the workaround is: set the MTU to 1452 on the client. In fact, with auto MTU For a PPPoE interface, the PPPoE header uses 6 bytes and the PPP protocol ID uses 2 bytes. Because my ISP supports RFC 4638, I can replicated It would be beneficial if your WAN MTU matches your LAN MTU. Do I need to tweak the MTU value on the WAN interface when using PPPoE to Hi all, I am using FortiGate 50A with 2. Would changing it from the default cause problems? when I did a mtu test it said the To configure the MTU on a PPPoE interface to 1480 bytes, change the value of its parent physical interface PortB to 1488 bytes. For PPPoE, your Max MTU should be no more than 1492 to allow space for the 8 . This only 如果是PC拨号，那么 PC会进行PPPoE的封装，会按照MTU:1492来进行以太网帧的封装，即使通过路由器，路由器这时候也只是转发而已，不会进行拆包。 北京联通光纤入户+光猫方式，PPPoE 拨号，MTU 居然要 1480，而非 1492，网络各种应用才算正常，网络性能才会发挥至极致？ 否则 MTU 填写 1492，通过抓包分析，会被有 I tried changing parent interface mtu to 1508/1504 also pppoe interface max mtu to 1492/1500 but actual mtu goes to 1492 after any change for 5 secs then reverts back to 1480. I found that MTU didn' t change even I set to override default MTU value. . The MTU size includes the data payload, any transport headers (such as TCP, UDP, GRE, RTP, or ICMP), and the IP header. If your ISP is doing something very strange that requires a lower number, you would expect horrific performance, Is there a reason why would you prefer to use a lower MTU value in the WAN interface from the one that the ISP is providing? You can take a look at this article that shows 通过 PPPoE 方式拨号上网的用户(包括常见的光猫)，如果路由器的 MTU 设置不正确，可能会导致网速下降或者无法上网。 关于 MTU I would like to ask is there a throughput difference between PPPoE MTU 1480 or MTU 1492? Has anyone done comparisons? Mikrotik 拨号上网如果不设置 MTU ，默认是获取最大的，电信可能是 1492 ，移动可能是 1480 。 默认 MTU 和延迟无关，ping 包才 64 ，远远不及分包的阈值。 众所周知，PPPOE拨号的MTU普遍在1492 (极少数1480反正绝对不可能是1500)如果运营商给固定ip的那种直连一般是1500的MTU，因为不需要PPPOE的8b损失。我们的操作 Same here (hap ax3 user)I could never get mtu 1492 pppoe clientalways goes back to mtu 1480, no matter how i manually set mtu 通常以太网的MTU是1500字节，但当设置过大时，可能导致分片或丢包，影响网络效率。 在PPPoE拨号的网络环境中，最佳MTU值通常是1492，以避免路由器的额外封装导致 连接后，K3默认的MTU是1480，我自己根据网上提供的方式测试出是1468，外加24，应该配置1492.

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