Are you wanting to truly join, ie extend your vlan to second site meaning that both sites will be the same vlan? Then you are probably looking at VPLS. But if you want the configuration to set up a GRE tunnel, then :. Ethernet Switching. Sign In. Global Communities. Community Resources. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for. Search instead for. Did you mean:. In the You can use GRE tunneling services to encapsulate any network layer protocol over any other network layer protocol. Acting as a tunnel source router, the switch encapsulates a payload packet that is to be transported through a tunnel to a destination network. The switch first encapsulates the payload packet in a GRE packet and then encapsulates the resulting GRE packet in a delivery protocol. A switch performing the role of a tunnel remote router extracts the tunneled packet and forwards the packet to the destination network.
GRE tunnels can be used to connect noncontiguous networks and to provide options for networks that contain protocols with limited hop counts. Message 1 of 3 5, Views. All forum topics Previous Topic Next Topic. If you think I earned it! If this solution worked for you please flag my post as an "Accepted Solution" so others can benefit.
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For setting up the interface both on my source and destination, the following two sets of commands are used. The above configuration is all logical in nature so we have to assign a physical interface for data transmission and receiving utilizing above logical interfaces.
Here is a bonus configuration, right, GRE configuration is complete with above commands but trust me it will not transport data. Therefore, we would like to put a little more effort to make it happen. It is up to your understanding which routing methodology you have to set for your network i. After careful consideration, you will notice that the GRE tunnel has gone up and you can verify whether the traffic is flowing from the gr interface or not by entering the following commands.
After we have configured one end of the tunnel Site Athe next task is to run all of those commands on the second end of the tunnel Site B.
Feb 13, 3 min read. Pre-requisites: Before we go in the actual configuration, here is a checklist that you must have before configuring your GRE tunnel between sites.Command introduced in Junos OS Release GRE interfaces are not supported or configurable for other applications.
Output fields are listed in the approximate order in which they appear. State of the interface. Information about the physical device. Information about the interface.
The number of and the rate at which input and output bytes and packets are received and transmitted on the physical interface. Information about the logical interface.
GRE-specific information about the logical interface is indicated by the presence or absence of the following value in this field:. Reassemble-Pkts —If the Flags field includes this string, the GRE tunnel is configured to reassemble tunnel packets that were fragmented after tunnel encapsulation.
IP header of the logical interface. If the tunnel key statement is configured, this information is included in the IP Header entry. Off —ToS bits were not copied from the payload packet header and are set to 0 in the GRE packet header. Note: EX Series switches do not support copying ToS bits to the encapsulated packet, so the value of this field is always Off in switch output.
Note: EX Series switches do not support configuration of GRE tunnel keepalive times and hold times, so the value of this field is always Off in switch output. If keepalive messages are not received by either end of the GRE tunnel within the hold-time period, the GRE keepalive adjacency state is down even when the GRE tunnel is up. Total number of bytes and packets received and transmitted on the logical interface. These statistics are the sum of the local and transit statistics.
When a burst of traffic is received, the value in the output packet rate field might briefly exceed the peak cell rate.
It takes awhile generally, less than 1 second for this counter to stabilize. Statistics for traffic received from and transmitted to the Routing Engine.
Statistics for traffic transiting the router. Protocol family configured on the logical interface, such as isoinet6or mpls. Protocol family configured on the logical interface. If the protocol is inetthe IP address of the interface is also displayed. Routing table in which the logical interface address is located.
For example, 0 refers to the routing table inet. Information about the protocol family flags. Information about the address flags. The output for the show interfaces extensive command is identical to that for the show interfaces detail command.
It only takes a minute to sign up. I'm attempting to provide guest internet access to a remote site that only has a WAN connection back to the main office. The main office has an internet connection that is currently used by guests. My thought was to:. I'm new at this, so I'm hoping someone can help me figure out where I might be going wrong. I appreciate the help.
Here is the important info. I'm currently at a loss. Can anyone see something wrong with my configuration? Anything more I can provide to assist with troubleshooting? Sign up to join this community.
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When the required services are available on the router, you can create a pseudo-interface called gr. In this command, fpc x pic x points to the interface module line card whose resources we want to share for the purpose of tunneling. Juniper MX routers do not support network address translation NATand so we either need to configure the new IP on the server itself, or configure NAT on some other device along the route.
Static routing sends traffic from the Incapsula Protected IP to a fixed address for your server. If you want to use symmetric routing, you must, as a final step, configure policy-based routing to ensure a symmetric flow. With symmetric routing, traffic directed to your network through the GRE interface must return through the same interface. This completes your configuration. From this point, you can ping the server and start seeing traffic routed through Incapsula.
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Dor Cohen. First, configure your firewall device with the appropriate tunnel interfaces. After this is done, we can proceed to configure your firewall device with the appropriate tunnel interfaces. Enable the GRE service on the router. To enable the service, issue the following command: root mx set chassis fpc x pic x tunnel-services In this command, fpc x pic x points to the interface module line card whose resources we want to share for the purpose of tunneling.
Configure the Incapsula Protected IP on your server. Configure your router with a static route to direct traffic toward it. This IP is one that belongs to your local area network. Example root mx set routing-options static route The purpose of term 2 is to match all other traffic and route it normally by using the global routing table. Read next. From our blog. Imperva Launches the Cyber Threat Index.
Thank You! An Imperva security specialist will contact you shortly.Understanding Generic Routing Encapsulation. Configuring Generic Routing Encapsulation Tunneling.
Generic routing encapsulation GRE provides a secure path for transporting packets of data by tunneling the packets. Generic routing encapsulation GRE provides a private, secure path for transporting packets through an otherwise public network by encapsulating or tunneling the packets. GRE encapsulates data packets and redirects them to a device that de-encapsulates them and routes them to their final destination.
This allows the source and destination switches to operate as if they have a virtual point-to-point connection with each other because the outer header applied by GRE is transparent to the encapsulated payload packet.
In addition, GRE tunnels can encapsulate multicast data streams for transmission over the Internet.VxLAN - Part 1 - How VxLAN Works
For a list of limitations, see Configuration Limitations. As a tunnel source routerthe switch encapsulates a payload packet for transport through the tunnel to a destination network. The payload packet is first encapsulated in a GRE packet, and then the GRE packet is encapsulated in a delivery protocol. The switch performing the role of a tunnel remote router extracts the tunneled packet and forwards the packet to its destination. Data is routed by the system to the GRE endpoint over routes established in the route table.
When a data packet is received by the GRE endpoint, it is de-encapsulated and routed again to its destination address. GRE tunnels are stateless -—that is, the endpoint of the tunnel contains no information about the state or availability of the remote tunnel endpoint. Therefore, the switch operating as a tunnel source router cannot change the state of the GRE tunnel interface to down if the remote endpoint is unreachable.
Encapsulation and De-Encapsulation on the Switch. Encapsulation—A switch operating as a tunnel source router encapsulates and forwards GRE packets as follows:. De-encapsulation—A switch operating as a tunnel remote router handles GRE packets as follows:. That is, you can create a total of GRE tunnels, regardless of which method you use.
If the first switch is also connected to a third switch, the possible maximum number of tunnels is When a network experiences congestion and delay, some packets might be dropped. Junos OS class of service CoS divides traffic into classes to which you can apply different levels of throughput and packet loss when congestion occurs and thereby set rules for packet loss.
At the GRE tunnel source—On a switch operating as a tunnel source router, you can apply CoS classifiers on an ingress port or on a GRE portwith the following results on CoS component support on tunneled packets:. Schedulers only—Based on the CoS classification on the ingress port, you can apply CoS schedulers on a GRE port of the switch to define output queues and control the transmission of packets through the tunnel after GRE encapsulation.
However, you cannot apply CoS rewrite rules to these packets. Schedulers and rewrite rules—Depending on the CoS classification on the GRE port, you can apply both schedulers and rewrite rules to the encapsulated packets transmitted through the tunnel.
At the GRE tunnel endpoint—When the switch is a tunnel remote router, you can apply CoS classifiers on the GRE port and schedulers and rewrite rules on the egress port to control the transmission of a de-encapsulated GRE packet out from the egress port.
Firewall filters provide rules that define whether to permit, deny, or forward packets that are transiting an interface on a switch. Because of the encapsulation and de-encapsulation performed by GRE, you are constrained as to where you can apply a firewall filter to filter tunneled packets and which header will be affected. You can also use a firewall filter to de-encapsulate GRE traffic on switches. This feature provides significant benefits in terms of scalability, performance, and flexibility because you don't need to create a tunnel interface to perform the de-encapsulation.
For example, you can terminate many tunnels from multiple source IP addresses with one firewall term. If data is routed through the tunnel interface, the tunnel might fail. To keep the interface operational, we recommend that you use a static route, disable OSPF on the tunnel interface, or configure the peer not to advertise the tunnel destination over the tunnel interface.
QFX series switches do not support configuring GRE interface and the underlying tunnel source interface in two different routing instances.So this is an example of Asymmetric routing. When I try to visit some websites, they do not open. Or is it that http traffic to and from various sites goes out and comes in directly on Location B without any involvement of location A? In your setup lower MTU frames might be getting passed as it is whie MTU of might be causing packet drops or fragmentation.
So what do you think? I have tried increasing MTU size todf-bit removal, path-mtu-discovery. Nothing worked! I do not see this as an issue unless a device is incorrectly dropping the traffic or fragmenting it which can be found out using packet captures on the devices in the path. Please let me know if the connectivity is correct? To get round this problem, you may find it helpful to implement Baby Jumbo Frames that will allow for encapsulation.
I have found that using BJF, browsing the internet is smoother, faster and less frenetic. This does involve making sure all devices have their MTUs set appropriately. I have to adjust MTU differently on all these different types of device as more encapsulation occurs at each stage, and each type of device has different capabilities as far as maximum MTU is concerned.
Critically, I had to discover if my Fibre cabinet and its Exchange connection had been upgraded to accept BJF yes, it had to full Jumbo framesthen I had to check the maximum MTU the modem could handle, then the maximum that PPPoE would pass through, and so on back to the switch and workstation.
SO the MTU increases as packets pass from workstation to the internet, matching the increase in packet size. Simply adjusting the size on one device in isolation is not sufficient.
When you have it right you know because web pages "snap" rather than dawdle. But it all depends on the specific equipment and how the internet provider has configured your connection, and the ability of the modem to work with different frame sizes.
So it would be misleading for me to give you my sizes, because they are not universally applicable. If one device is a bottleneck all the devices connecting to it have to be adjusted.
Setting up a GRE Tunnel on a Juniper MX Router
PPPoE encapsulation. Be aware that different manufacturers do not always define MTU in the same way, or even across all their product lines. You need to adjust mss on a mikrotik. As SRX never sees the syn packets only returning traffic it will not adjust it. SRX Services Gateway. Sign In. Global Communities. Community Resources. Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
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