Openwrt 4G Volte WiFi Router with Broadband Internet

We have been ISO9001, CE, and GS certified and strictly adhere to their good quality specifications for M2M IoT Gateway, Wind Turbines Real-time Monitoring, Cat6 4G LTE Router. We always adhere to the spirit of R&D and innovation and the purpose of continuously improving product quality. We hope to cooperate with new and old customers and friends to help each other, sincerely cooperate and create brilliance! We will work whole-heartedly to improve our products and services. We firmly believe that as long as we take the scientific development concept and market as the guidance, the innovation as the driving force, the quality of survival, constantly innovate, we will certainly win a better tomorrow! We always insist on the principle of 'Quality and service are the life of the product'.

The Meizo R58 outdoor 4G router CPU is using Industrial Grade equipment design standards, passed CE, FCC and EMC test, stable and reliable. Multiple VPN encryption protocols as L2TP, IPSec, PPTP and GRE are owned, making it readily ideal for delivering optimal network connectivity to all oil and mining site, as well as serving as the reliable communication backbones for critical communication applications. Instant POS Setup for Credit Card Access in Remote Area . Its CPU is using Broadcom chipset, integrated with industrial grade 4G modem, offering WAN, LAN, SIM, VPN, VRRP, WiFi, and Serial port services, product line supporting the following radio access technologies: LTE, HSPA+, HSPA, UMTS, EDGE, CDMA2000, GPRS and GSM . By owning automatic connection monitoring and heartbeat detection, make sure the router to be always online.

The R58 4G LTE products have thousands of installed bases in China, North America, South East Asia, Africa and other areas, too. Our outdoor 4G/LTE routers offer superior RF and antenna engineering for maximum LTE performance, as well as comprehensive networking solutions that are ready to be utilized in a diversity of revenue generating applications and vertical markets.

What is VRRP?
The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol that provides for automatic assignment of available Internet Protocol (IP) routers to participating hosts. This increases the availability and reliability of routing paths via automatic default gateway selections on an IP subnetwork.
The protocol achieves this by creation of virtual routers, which are an abstract representation of multiple routers, i.e. master and backup routers, acting as a group. The default gateway of a participating host is assigned to the virtual router instead of a physical router. If the physical router that is routing packets on behalf of the virtual router fails, another physical router is selected to automatically replace it. The physical router that is forwarding packets at any given time is called the master router.

VRRP provides information on the state of a router, not the routes processed and exchanged by that router. Each VRRP instance is limited, in scope, to a single subnet. It does not advertise IP routes beyond that subnet or affect the routing table in any way. VRRP can be used in Ethernet, MPLS and token ring networks with Internet Protocol Version 4 (IPv4), as well as IPv6.

The protocol is described in Internet Engineering Task Force (IETF) publication RFC 5798, which is an open standard, but Cisco claims that a similar protocol with essentially the same facility is patented and licensed; however in reply to a direct request Robert Barr of Cisco replied in 2001 that they will not assert any patent claims unless someone tried to assert a claim against Cisco. IBM also claims covering patents and their statement is readable on the IETF webpage

Implementation
A virtual router must use 00-00-5E-00-01-XX as its Media Access Control (MAC) address. The last byte of the address (XX) is the Virtual Router IDentifier (VRID), which is different for each virtual router in the network. This address is used by only one physical router at a time, and it will reply with this MAC address when an ARP request is sent for the virtual router's IP address.

Physical routers within the virtual router must communicate within themselves using packets with multicast IP address 224.0.0.18 and IP protocol number 112.

Routers have a priority of between 1-254 and the router with the highest priority will become the master. The default priority is 100, for address owner the priority is always 255.

Elections of master routers
A failure to receive a multicast packet from the master router for a period longer than three times the advertisement timer causes the backup routers to assume that the master router is dead. The virtual router then transitions into an unsteady state and an election process is initiated to select the next master router from the backup routers. This is fulfilled through the use of multicast packets.

Backup router(s) are only supposed to send multicast packets during an election process. One exception to this rule is when a physical router is configured with a higher priority than the current master, which means that on connection to the network it will preempt the master status. This allows a system administrator to force a physical router to the master state immediately after booting, for example when that particular router is more powerful than others within the virtual router. The backup router with the highest priority becomes the master router by raising its priority above that of the current master. It will then take responsibility for routing packets sent to the virtual gateway's MAC address. In cases where backup routers all have the same priority, the backup router with the highest IP address becomes the master router.

All physical routers acting as a virtual router must be in the same local area network (LAN) segment. Communication within the virtual router takes place periodically. This period can be adjusted by changing advertisement interval timers. The shorter the advertisement interval, the shorter the black hole period, though at the expense of more traffic in the network. Security is achieved by responding only to first hop packets, though other mechanisms are provided to reinforce this, particularly against local attacks. Election process is made orderly through the use of skew time, derived from a router's priority and used to reduce the chance of the thundering herd problem occurring during election. The skew time is given by the formula (256-Priority)/256 (expressed in milliseconds) RFC 3768 .

Our mission will be to build creative solutions to consumers with a great experience for Openwrt 4G Volte WiFi Router with Broadband Internet. Our company has a team of experienced, well-trained, disciplined and energetic professionals. We have been making our products for more than 20 years.