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    Ip tunnel add gre. 18 ttl 255 ip link set netb up ip addr add 10.

    Ip tunnel add gre 88 ttl 255 ip addr add 10. 4 # modprobe ipv6 # ip tunnel add sittun mode sit local 10. How does the use of GRE impact MTU and MSS requirements? Using F5 tunneling technologies, you can set up tunneling from devices on different Layer 2 networks, or scale multi-site data centers over Layer 3 pathways. Karena kita menggunkan IP Address Point-To-Point (IP address dengan prefix /32) maka untuk pengisian network adalah IP Address dari router lawannya. iface gr0 inet manual pre-up ip tunnel add gr0 mode gre remote 10. 配置GRE隧道的IP地址. 33. 2/24 dev tun0 ubuntu@host-2:~$ sudo ip link set tun0 up. tunnel source {ip-address | ipv6-address | interface . All tunnel interfaces of At the command line these commands work and build a GRE tunnel with an MTU of 1476. 18 ttl 255 ip link set netb up ip addr add 10. Configure Routing for the Tunnel. Ethernet interfaces have an MTU value of 1500 bytes. 2; Configuring the GRE route Sophos Firewall: Create an IP tunnel between the head and branch offices. 10 local 10. 6. The tunnel interface can have either IPv4 or IPv6 addresses assigned (this is not shown in the task). com does not work. 233. GRE tunnel interface will add another 24 bytes as overhead before handing it down to the physical interface for transmission. 0/28 table GRE Under Device# show interfaces tunnel 21 Tunnel21 is up, line protocol is up Hardware is Tunnel MTU 17864 bytes, BW 100 Kbit/sec, DLY 50000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 10. GRE Tunnel supports multicast traffic, making it suitable for applications that require broadcasting data, while IP Tunnel may have higher overhead due to the additional ip tunnel add add a new tunnel ip tunnel change change an existing tunnel ip tunnel delete destroy a tunnel name NAME (default) select the tunnel device name. 30. 28。隧道数据包将被从121. 42. You can change this later. x] local [y. ip addr add 10. Create the GRE Tunnel Interface. 第1行,我们添加了一个隧道设备,并且称之为netb(为了能够表示出这个隧道通向哪里). 123也就是本地IP地址发起，其TTL字段被设置为255。 GRE tunnel uses a ‘tunnel’ interface a logical interface configured on the router with an IP address where packets are encapsulated and decapsulate as they enter or exit the GRE tunnel. # ip tunnel add gre1 mode gre remote 111. When GRE IPv6 tunnels are configured, IPv6 addresses are assigned to the tunnel source and the tunnel destination. 0 10. 51 and 2nd with wlan2 192. To configure GRE, we need two routers that we want to communicate. x. Only applicable for GRE tunnels. sysctl -w net. 0/24 dev netb 让我们稍微讨论一下. It will be "visible" on the IPv6 internet with this ip tunnel add netb mode gre remote 172. In an encapsulation or decapsulation tunnel where only either source or destination is mentioned, the source-destination pair should also be unique when compared to ubuntu@host-2:~$ sudo ip tunnel add tun0 mode gre remote 10. ip route 10. This address will be our Tunnel’s one end IP address. 需要模块:ip_gre. service iptables stop. First of all, GRE works using port 47 in UDP, so if your router is behind a box or a NAT, be sure to redirect port 47 to it. 2 remote 1. Introduction. Only GRE Tunnel Configuration Parameters. 3/24 MTU 1514 bytes, BW 9 Kbit, DLY 500000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, loopback not set Keepalive not set Tunnel source 192. crypto ipsec profile ipsec-profile set transform-set ipsec-profile ! interface Tunnel1 ip address 192. Premièrement GRE fonctionne en utilisant le port 47 en UDP, si vous votre routeur est derrière une box ou un NAT, veillez à rediriger le port 47 vers celui ci. 2 local 192. Assign IPv6 address to home computer. Particularly, it may be even eth0. Assign an IP address to the tunnel interface: sudo ip addr add 10. Physical interface would Branch#show interfaces tunnel 1 Tunnel1 is up, line protocol is up Hardware is Tunnel Internet address is 192. mode gre con-name gre1 ifname gre1 remote 203. 0R8 onward, the gre-tunnel parameter has been replaced by the ip-tunnel parameter together with a sub-parameter gre-header to identify this to be a GRE tunnel. 168 $ sudo ip tunnel add gre0 mode gre remote 172. First of all you need a name for your tunnel. I found following solution that works for me. After inserting the ip_gre module, but without creating any tunnel, gre0 appears and is undeletable and unchangeable as expected. ip route add default via 172. ( only GRE tunnels ) use keyed GRE with key K. 1/24 dev gre1. Definitely, the NAT in the modem is complicating the thing as always NAT does. 3 (FastEthernet0/0), destination 192. 1 dev netb ip route add 10. 使用lsmod|grep ip_gre检查 IP tunneling: 1. Example: Device The following examples show how to configure a GRE over IPsec tunnel. To configure the tunnel source and destination, issue the tunnel source {ip-address | interface-type} and tunnel destination {host-name | ip-address} commands under the The ip_gre module lets your Linux system use GRE tunnels, which help different networks connect over the internet. Im 已解决: 我想使用 tunnel（gre），于是在本机上（ubuntu）输入命令： > sudo ip tunnel add tun0 mode gre local 192. key K ikey K okey K ( only GRE tunnels) use keyed GRE with key K. 51 ip link set dev gre1 up gre1@NONE: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1462 qdisc pfifo_fast state UNKNOWN Creating tunnels with iproute2 is very easy. GRE tunnels are IP-over-IP tunnels which can encapsulate IPv4/IPv6 and unicast/multicast traffic. 2/24 dev gre0 At this point, a GRE tunnel should be established between host A and host B . 可以看到，我们搭建了名为qingsu的GRE隧道，并且将服务器A和B构建成了一个虚拟局域网，服务器A的局域网内地址为10. Step 7. 19. 10. GRE (Generic Routing Encapsulation) is a tunneling protocol that encapsulates a wide varitey of layer-3 network protocols such as IPv4/v6, IPSec e. 2. PC1: ip link add gre1 type gretap remote 192. 16. 13. 1/30 dev tunnel0 ip addr add 172. 0/24 network to the Whenever we create tunnel interfaces, the GRE IP MTU is automatically configured 24 bytes less than the outbound physical interface MTU. Maximum number of characters: 58. 在创建GRE隧道之后，需要为它们配置IP地址。可以通过以下命令在ns1中配置GRE隧道的IP地址： “` $ ip netns exec ns1 ip addr add 10. Any suggestions? networking; The ip_gre module is not inserted by default in the kernel after installing Debian. Generic Enapsulation Tunnel是一种 网络隧道技术 ，之所以称为通用隧道技术，是它可以用来将Ethernet、IP、MPLS等多种报文封装在IP报文中予以转发，在网络中存在较为大规模的应用。. 255. 1 添加GRE隧道 ip tunnel add Tunnel-1 mode gre remote 192. icsum Require that all incoming packets have the correct checksum. “Customer Private IP” and “Incapsula Private IP” that will be used, together with the “Customer Public IP” to configure the GRE. Misal, seperti contoh diatas untuk interface GRE Tunnel I'm trying to transport over a gretap tunnel between two Linux (Centos 6) hosts some cloned IP pkts in order to feed an IDS style device. When multiple devices feed into a BIG-IP To configure GRE IPv6 tunnels, perform this procedure: Before you begin. ip tunnel add tun0 mode gre remote <broker-ipv4> local <my-static-ipv4> dev eth0 ip -6 addr add <ipv6-client-api>/mask dev tun0 ip link set tun0 up ip -6 route add default via tun0 Running. Location X – Location Z . ikey KEY Specify the input key for the Cisco GRE tunnel. 1 (Inside address, subet, End tunnel adress) Location Y. ip link set dev tun1 up. The <NAME> is an arbitrary string. mode MODE set the tunnel mode. When you know the IP address of the devices at both ends of the tunnel, you can create a point-to-point encapsulation tunnel between a BIG-IP ® system and another device. 1，服务器B的局域网内地址为10. 1/27 dev tun8. 18 local 172. GRE is a tunneling protocol that was originally developed by Cisco, and it can do a few more things than IP-in-IP tunneling. Location X. Le tunnel GRE est un des tunnels les plus basiques, mais il n'est pas le plus simple non plus. K is either a number or an IP address-like dotted quad. 1/24 dev gre0 Dans ce qui précède, nous créons un périphérique de tunnel de type GRE appelé gre0 et définissons son $ sudo ip tunnel add gre0 mode gre remote 172. The definition for a GRE tunnel before 10. 1 with the remote system's public IP. 61. Test tunnel by tracert from a computer to another. Ich kann nun von der pfSense die IP 172. 1 key 1234 ip link set dev tun8 up ip address add 10. sudo ip addr add TunnelIP_A peer TunnelIP_B dev gre1. You can't change this name later. 123 ttl 255 # ip link set gre1 up # ip addr add 10. 113 local 192. Ensure the IP addresses are part of a separate subnet that’s different from the main server IPs. 2/30 dev gre1 sudo ip link set gre1 up # Set up the new route sudo echo '100 GRE' >> /etc/iproute2/rt_tables sudo ip rule add from 10. The device then adds the # On Server A: ip link add name ipip0 type ipip local LOCAL_IPv4_ADDR remote REMOTE_IPv4_ADDR ip link set ipip0 up ip addr add INTERNAL_IPV4_ADDR/24 dev ipip0 # 添加远程设备其他子网的路由 ip (only GRE tunnels ) use keyed GRE with key K. 21 local 172. 0/24 On considère que ces deux sous réseaux symbolisent deux sites différents. 1. 131. Enter a hardware name for the interface. 250 ttl 255 add tunnel gre0 failed: No such device 我到网上搜了一下，似乎是gre模块的问题，于是按照网上的信息排查，如下： > lsmod | grep gre 没有输出 &gt; lsmod | grep This chapter describes how to configure IP tunnels using Generic Route Encapsulation (GRE) on the Figure 7-1 shows the IP tunnel components for a GRE tunnel. 42 Click Interface > GRE Tunnels. 25 local 192. The key parameter sets the key to use in both directions. The following example shows how to configure an Internet Key Exchange Version 2 (IKEv2) key ring with symmetric preshared keys based on an IP address system gre tunnel add name gre local-gw PortB remote-gw 202. Enter a name. 51. Syntax ip tunnel { add | change | del | show The ikey and okey parameters set different keys for input and output. Linux系统原生支持了GRE接口，其配置命令如下： ip tunnel add gret1 mode gre remote 45. , tunnel 0 or ip tunnel add tunnel0 mode gre remote 192. 183 local 189. 3w次，点赞10次，收藏42次。本文详细介绍了Linux系统中IP隧道技术的三种类型：ipip、gre和sit，以及如何配置GRE隧道来实现跨公网的网络互通。通过在两台虚拟机上设置不同网络环境，演示了GRE隧道的创建、路由配置和防火墙规则调整，从而实现两台主机私有网络的通 IPv6 over IP: sit0: gre: ANY over GRE over IP: gre0: All the kinds of tunnels are created with one command: ip tunnel add <NAME> mode <MODE> [ local <S> ] [ remote <D> ] This command creates new tunnel device with name <NAME>. 8. $ ip netns exec ns2 ip tunnel add gre1 mode gre remote 192. Ip route 10. 21 ttl 255 ip link set neta up ip addr add 10. ipv4. Available modes depend on the encapsulating address family. ①. 1 dev tunnel0 table There must be IP routes to make sure network traffic goes to right places. csum, icsum, ocsum (only GRE tunnels) generate/require checksums for tunneled packets. Under DDoS Attack? 1-866-777-9980. Why Use a GRE Tunnel? 3. 3. 1/30 dev Using F5 ® tunneling technologies, you can set up tunneling from devices on different Layer 2 networks, or scale multi-site data centers over Layer 3 pathways. The rest of parameters set different tunnel Set the IPv4 address to the gre1 device: # nmcli connection modify gre1 ipv4. y. Das Internet basiert momentan auf das IPv4 oder IPv6 Protokoll. 5 remote 10. GRE. In this example, Ethernet0/0 has an IPv6 address, and this is the source address used by the tunnel interface. 并且表示要使用GRE协议 (mode We explain how to configure a generic routing encapsulation (GRE) tunnel for Incapsula IP Protection on an Amazon Web Services Ubuntu Linux instance. Frontend server, edit your front-ip and backend-ip addresses #!/bin/sh ##A-Server-Front apt install iptables iproute2 lsmod | grep gre modprobe ip_gre lsmod | grep gre echo 'net. y] ttl 255 ip link set gre1 up ip addr add [z. Create the GRE tunnel: Syntax: system gre tunnel add name <name> local-gw <WAN port> remote-gw <remote gateway IP address> local-ip <local IP address> remote-ip <remote IP address> Note : The local-ip and remote-ip can be any unused IP addresses that are ip tunnel add add a new tunnel ip tunnel change change an existing tunnel ip tunnel delete destroy a tunnel name NAME (default) select the tunnel device name. This IP can also be Nous allons donc mettre en place un tunnel GRE sécurisé avec IPSec entre la machine A2 et C1 afin de permettre la communication entre les deux sous réseaux 192. 95/27 dev eth0. ip_forward=1. ping6 google. 99. 1/24 dev gre1 这边我只介绍最常见的GRE以及IPIP，因为EOIP在Linux下需要额外对内核Patch，而IPSec真的比较烦人。另外推荐WireGuard——> 传送门. The original passenger protocol packet becomes the GRE payload and the device adds a GRE header to the packet. Bring up the GRE interface: sudo ip link set gre1 up. I am trying to configure a gre tunnel between two Ubuntu PCs: 1st with wlan1 interface 192. Jedenfalls kann man auch das neue Protokoll nutzen bei Noez oder noch das ältere IPv4 Protokoll. 1 Tunnel protocol/transport GRE/IP Key 0x124B Don't create multiple GRE/IP-in-IP tunnels with the same pair of source and destination IP address or interface name. Create a GRE tunnel when you want to direct packets that are destined for an IP address to take a certain point-to-point path, for example to a cloud-based proxy or to a partner network. 注意! 这样配置的隧道缺少了远端出口的地址，所以 key 是鉴别隧道流量的唯一方法，因此 key 是必须的。 The following example shows how to configure a GRE tunnel over an IPv6 transport. 1/24 dev gre0 上記では、gre0 という GRE タイプのトンネル デバイスを作成し、そのリモート アドレスを 172. tunnel protection IPsec profile profile-name. remote ADDRESS set the remote endpoint of the tunnel. 1 table GRE. $ sudo ip tunnel add gre0 mode gre remote 192. 如果 The IP header encapsulates the original packet's header and payload. 1 ttl 255 sudo ip addr add 10. 2 pingen. 1/24 dev gre0 $ sudo ip link set gre0 down $ sudo ip tunnel del gre0 相关文章: 2022 年，我在比特币上投资了 50 美元，这是一次愉快的经历。 Assign an IP address to the GRE tunnel interface: Assign a tunnel IP address for both Server A and Server B. 7 remote 10. 2。 在Server B上，使用以下命令创建GRE隧道接口： ip link set gre-tunnel up ip addr add a:b:c:d:e::1/80 dev gre-tunnel 第一行建立隧道， gre-tunnel 是隧道名称，可以按自己喜欢的来，记得其他的也要一起改 How to create GRE tunnel in Linux servers? Check out this knowledge base article, created by our specialists to learn more. The ikey and okey parameters set different keys for input and output. 0R8 was: interface "int-gre-tunnel" tunnel create sap tunnel-1. 22. The remote and local parameters set the public IP addresses of Here is how to create a GRE tunnel: # ip link add name gre1 type ip6gre local LOCAL_IPv6_ADDR remote REMOTE_IPv6_ADDR # ip link add name gretap1 type ip6gretap local LOCAL_IPv6_ADDR remote 5. 1，Server B的IP地址为192. g. Usages of a GRE Tunnel 4. 6 ttl 64 dev eth0 # ip add add dev gretun 10. Configure all tunnels with unique source-destination pairs. 1/24 dev gre01 $ sudo ip link set gre01 up 设备B： $ sudo ip tunnel add gre01 mode gre remote 192. 1 pmtudisc ip link set gre6in4 up. 1. 1/24 Set the IPv4 address to the gre1 device: # nmcli connection modify gre1 ipv4. 101. The Setup. Partners. KEY must be either in dotted quad (dotted decimal) or a number. Specify a tunnel ID in the Tunnel ID field. The GRE tunnel is one of the most basic tunnels, but it's not the simplest either. okey KEY Same as ikey, but set the output key instead. 204 ttl 255 $ sudo ip link set gre0 up $ sudo ip addr add 10. In these routers, firstly, we need to create a Tunnel interface and then we add Tunnel IP Address to this interface. The packets travel through the GRE tunnel (over a transit network such as the internet) to the cloud service while on their way to the destination address. 6. 0/30 table GRE sudo ip route add default via 10. 11. Set up GRE tunnel between local "virtual" address and tunnel endpoint (reachable only via IPSec): ip tunnel add gre6in4 mode gre ttl 255 remote 192. 99 remote 88. Configure the tunnel on the second endpoint with the example address 50. 23. 2/30 peer 172. 202 local-ip 5. So if you already have a netplan configuration on one side: tunnels: gre1: mode: gre local: 109. csum, icsum, ocsum (only GRE tunnels ) generate/require # modprobe ip_gre # ip tunnel add gretun mode gre local 10. Masuk ke menu Interfaces -> GRE Tunnel -> klik Add [+]. The Add GRE Tunnel section is displayed. 9 local 10. 1 GRE tunnel configuration. Select the IP version as IPv4. # ip tunnel add GREAB mode gre local 2. name NAME (default) select the tunnel device name. On the slave server: chkconfig iptables off. ip_forward=1' >> /etc/sysctl. 1/30' Note that a /30 subnet with two usable IP addresses is sufficient for the tunnel. conf sysctl -p ip tunnel add gre1 mode gre local front-ip remote backend-ip ttl 255 ip addr add 10. This is the In this tutorial, we will explain what a GRE tunnel is and how to configure one. 1 remote 5. Assign the tunnel source and destination IP addresses to establish the connection endpoints. To use it on your servers, simply load this module into your system’s kernel with the following command: sudo In GRE Configuration Example, we will Configure GRE Tunnels with Cisco Packet Tracer. 1 peer 10. Give tunnel an IP. 123 ttl 255 ikey 0x222222 okey 0x111111 csum seq $ sudo ip addr add 10. 2/24 dev gre01 $ sudo ip link set gre01 up 再次WireShark抓包，查看GRE完整的头部信息： Nun, der Noez GRE Tunnel sollte auch wissen können, wo die Route hingeht. 45 Make sure GRE is available: modprobe ip_gre. Configuration d'un tunnel GRE. 0. 1 with this system's public IP and 50. Maximum number of characters: 10 ip tunnel add tun1 mode gre remote 98. Set up routing to direct traffic through the GRE tunnel interface. 2/30 dev gre1 ip link set gre1 up This is symmetric, in that the commands are nearly identical except for the addresses being swapped. In Only applicable for GRE tunnels. 2. Enter the destination, this is NOT the IP of the tunnel at the other side. 25 に設定します。 (only GRE tunnels ) use keyed GRE with key K. 246. Configure the gre1 connection to use a manual ip tunnel show - list tunnels. c inside a IPV4 protocol using a virutal point-to-point connection. Select the Mode as L3. To create a GRE tunnel on Linux, you need ip_gre kernel module, Create a GRE tunnel interface named gre1: # nmcli connection add type ip-tunnel ip-tunnel. While Zscaler has documentation about setting up GRE for using their services, their examples only cover Cisco and Juniper, so this article fills in the gap on how to set up GRE on the BIG-IP side of the tunnel. z]/30 dev gre1 In this blog, lets explore how GRE tunnels work using linux network namespaces. 10 local 198. If you choose to name it foo then you can create the tunnel with the command: ip tunnel add foo mode sit remote 192. 1, destination 172. 204 local 172. 17. 58. 13 local 192. Follow asked May 11, 2018 at 3:18. How Does sudo ip tunnel add gre1 mode gre remote 192. 0/24 dev neta: And when you want to remove the tunnel on router A: ip link set netb down ip tunnel del netb: Of course, you can replace netb with neta for router B. GRE tunneling. The icsum flag requires that all input packets have ip tunnel add neta mode gre remote 172. 254. 1 remote-ip 5. 245. 28. 134. Das könnt Ihr euch so vorstellen das die Computer alle eine eigene Internet IP im Globalen Netzwerk haben. method manual Add a static route that routes traffic to the 172. Reseller Program; Partners; Company. ip tunnel show does not display any tunnel. 10 dev ens33 ttl 255 post-down ip tunnel del gre0 How does this translate to netplan? networking; tunnel; netplan; Share. z. 51 ttl 128 # 配置一条以189 GRE 隧道路由宣告注意事项：使用动态路由协议宣告接口时千万不能宣告公网接口。OSPF邻居down了，一会又开始重新建邻居变成了full。配置完GRE隧道发现PC1和PC2还ping 不通，因为没有路由。实际的生产环境中基本上用的都是动态路由ospf。PC1与PC2之间互通,GRE VPN建成功。。青海分部IP地址、DHCP、NAT、路 文章浏览阅读1. 20. 2 ttl 255 $ ip netns exec ns2 ip link show gre1 “`. 100. 88. What Does Encapsulated Protocol Mean? 5. Select the IPv4 address type as one of the following options based on your requirements: Configuring a GRE Tunnel: Steps and Tips 1. $ sudo ip addr add 10. 97 local 106. What is GRE Tunnel? 2. 113. 0/24 dev tun1. 0/24 via 10. 25 ttl 255 $ sudo ip link set gre0 up $ sudo ip addr add 10. 添加GRE隧道时,需要指定隧道的名称，我这里叫做Tunnel-1; 因为要搭建GRE类型隧道，因此mode为gre。 ip tunnel add add a new tunnel ip tunnel change change an existing tunnel ip tunnel delete destroy a tunnel name NAME (default) select the tunnel device name. 1k次。Linux ipip隧道及实现一、IP隧道技术IP隧道技术：是路由器把一种网络层协议封装到另一个协议中以跨过网络传送到另一个路由器的处理过程。IP 隧道（IP tunneling）是将一个IP报文封装在另一个IP报 2. ip tunnel add tun8 mode gre local 192. ===== GRE TUNNEL FOR THIRD NETWORK. 123. 98 ttl 255. 252 tunnel source ip tunnel add qingsu mode gre local 99. To configure the tunnel source and destination, issue the tunnel source {ip-address | interface-type} and tunnel destination {host-name The below example explain about how to create simple GRE tunnels between endpoints and the necessary steps to create and verify the GRE tunnel between the two networks. 8 ttl 64 $ sudo ip tunnel add gre0 mode gre remote 172. 87. We will learn Generic Routing Encapsulation commands. 2 dev gre1 创建一个GRE类型隧道设备gre0, 并设置对端IP为111. 2 create From 10. 7. This means that a GRE packet usually has two IP headers: one for the original packet, and one added by the GRE protocol. csum, icsum, ocsum (only GRE tunnels ) generate/require ip tunnel add add a new tunnel ip tunnel change change an existing tunnel ip tunnel delete destroy a tunnel name NAME (default) select the tunnel device name. 104. 4 # ip route add 10. 文章浏览阅读2. addresses '10. 12. 5 ttl 255 habe ich ersetzt durch ip link add name gre1 type ip6gre local 2a03:4000:28:948:a8b6:9fff:XXXXXXXXX remote 2a00:6020:1000:XXXX::XXXX . 5. 73. Start by creating the GRE tunnel interface on your device. Et on va essayer de les interconnecter. 1 dev tunnel0 table GRE ip rule add from 203. 207. CLI-basedtunneldecapsulationconfiguration interfacetunnel-ip1 ipv4address101. 82 # Local main IP on ip tunnel add gre1 mode gre local 1. To verify that, from one tunneling end point, ping the other end point. 1: 1. 3. 2 / 30 dev qingsu ip link set qingsu up. 168. 3 peer 10. Pada parameter 'Local Address', Setting IP Address pada GRE Tunnel Router B. The interface's customizable name rather than the hardware name is shown in other settings. 4/32 # ip link set dev gretun up # ip route add 10. Improve this question. - Router (config)#interface tunnel 1. Given that PMTU discovery will not work on the cloned pkts I'm trying to transport I have to find a way to clear the DF bit in the header of the GRE pkt, so that it can be fragmented by the sending host and re-assembled at the other 可以看到，Linux 原生一共支持 5 种 IP 隧道。 ipip：即 IPv4 in IPv4，在 IPv4 报文的基础上再封装一个 IPv4 报文。; gre：即通用路由封装（Generic Routing Encapsulation），定义了在任意一种网络层协议上封装其他任意一种网络层协议的机制，IPv4 和 IPv6 都适用。; sit：和 ipip 类似，不同的是 sit 是用 IPv4 报文封装 bandwidth Set tunnel bandwidth informational parameter checksum enable end to end checksumming of packets destination destination of tunnel flow flow options key security or selector key mode tunnel encapsulation method mpls MPLS tunnel commands path-mtu-discovery Enable Path MTU Discovery on tunnel protection Enable tunnel protection rbscp Set 在Server A上，使用以下命令创建GRE隧道接口： sudo ip tunnel add gre0 mode gre remote Server-B-IP local Server-A-IP sudo ip link set gre0 up sudo ip addr add Server-A-IP dev gre0 这里假设Server A的IP地址为192. 1 255. R1's and R2's Internal subnets(192. 1/24 dev gre1 inux 上设置 GRE 下面我们将通过一个详细的实战模拟，展示如何在 Linux 上设置 GRE 隧道。 # Bring the tunnel online sudo ip tunnel add gre1 mode gre local 2. 1 ttl 255 sudo ip link set gre1 up sudo ip addr add 10. . 3 remote 192. 2/30 dev tunnel0 ip addr del 172. Do GRE Tunnel is easy to configure and deploy, while IP Tunnel may require more configuration and setup due to the complexity of encryption and authentication mechanisms. 0 255. 1 dev neta ip route add 10. Configure the gre1 connection to use a manual IPv4 configuration: # nmcli connection modify gre1 ipv4. ip addr add 98. 2 ttl 255 ip link set tunnel0 up mtu 1400 ip addr add 172. Go to Network > IP tunnels and click Add. t. Modes for IPv4 encapsulation available: ipip, sit, isatap, vti, and gre. Modes for IPv6 encapsulation available: ip6ip6, ipip6, ip6gre, vti6, and any. The ocsum flag calculates checksums for outgoing packets. For example, you can also transport multicast Make a new tunnel between locations. 2 . To add a new GRE tunnel, click + from the GRE Tunnel table. 1/30 dev tunnel0 Configuration TherearetwomethodstoconfigureGREtunneldecapsulation: 1. Identifies the IP address of the tunnel destination. Thus gre0 seems to be a dummy tunnel created by default by the ip_gre module. 16 dev eth0 ubuntu@host-2:~$ sudo ip addr add 172. 0/24 et 192. When you know the IP address of the devices at both ends of the tunnel, you ip tunnel add gre1 mode gre local backend-ip remote front-ip ttl 255 ip addr add 10. ip tunnel add gre1 mode gre remote [x. 59. Add an IP tunnel Jun 5, 2023. private:1 create gre-tunnel "gre-tunnel-1" to 10. Only the routers at each end of the GRE tunnel will reference the original, non-GRE IP header. GRE Configuration is a very simple configuration. 1 local 192. Due to this reason, GRE tunneling can allow transmission of Replace 40. adilias3 adilias3 configure terminal Create the GRE tunnel interface: Type the command below to create a tunnel interface: interface tunnel [TUNNEL_NUMBER] Choose a unique number for the tunnel, e. 28 local 121. rqw dfak oqjneb qslkb tuyz rqw zfhj ygkbt nvrikv dktlg yaewznk trnnb vqay ltnao ezffxd