Routeros netmap9/19/2023 ![]() Maximum packet size that can be received on the link. Mrru ( disabled | integer Default: disabled) Max packet size that L2TP interface will be able to send without packet fragmentation. Max packet size that L2TP interface will be able to receive without packet fragmentation. Since v6.0rc13, tunnel keepalive timeout in seconds. Keepalive-timeout ( integer Default: 60s) If selected, then route with gateway address from 10.112.112.0/24 network will be added while connection is not established. Since v6.2, sets distance value applied to auto created default route, if add-default-route is also selectedĬonnects only when outbound traffic is generated. Whether to add L2TP remote address as a default route.Īllow ( mschap2 | mschap1 | chap | pap Default: mschap2, mschap1, chap, pap)ĭefault-route-distance ( byte Default: ) Sub-menu: /interface l2tp-client Properties PropertyĪdd-default-route ( yes | no Default: no) ![]() This means that L2TP can be used with most firewalls and routers (even with NAT) by enabling UDP traffic to be routed through the firewall or router. UDP port 1701 is used only for link establishment, further traffic is using any available UDP port (which may or may not be 1701). L2TP traffic uses UDP protocol for both control and data packets. Full authentication and accounting of each connection may be done through a RADIUS client or locally. L2TP includes PPP authentication and accounting for each L2TP connection. The bridge should either have an administratively set MAC address or an Ethernet-like interface in it, as PPP links do not have MAC addresses. This way it is possible to setup bridging without EoIP. Multilink PPP (MP) is supported in order to provide MRRU (the ability to transmit full-sized 1500 and larger packets) and bridging over PPP links (using Bridge Control Protocol (BCP) that allows to send raw Ethernet frames over PPP links). The L2TP standard says that the most secure way to encrypt data is using L2TP over IPsec (Note that it is default mode for Microsoft L2TP client) as all L2TP control and data packets for a particular tunnel appear as homogeneous UDP/IP data packets to the IPsec system. It may also be useful to use L2TP just as any other tunneling protocol with or without encryption. From the user's perspective, there is no functional difference between having the L2 circuit terminate in a NAS directly or using L2TP. ![]() ![]() This allows the actual processing of PPP packets to be separated from the termination of the Layer 2 circuit. With L2TP, a user has a Layer 2 connection to an access concentrator - LAC (e.g., modem bank, ADSL DSLAM, etc.), and the concentrator then tunnels individual PPP frames to the Network Access Server - NAS. ![]() The purpose of this protocol is to allow the Layer 2 and PPP endpoints to reside on different devices interconnected by a packet-switched network. L2TP incorporates PPP and MPPE (Microsoft Point to Point Encryption) to make encrypted links. L2TP encapsulates PPP in virtual lines that run over IP, Frame Relay and other protocols (that are not currently supported by MikroTik RouterOS). L2TP is a secure tunnel protocol for transporting IP traffic using PPP. 5.4 L2TP/IpSec with static IPSec server setup. ![]()
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