Differences
This shows you the differences between two versions of the page.
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en:1xfaq_mtu_and_suprema_devices [2015/10/08 17:51] 127.0.0.1 external edit |
en:1xfaq_mtu_and_suprema_devices [2019/12/27 11:48] (current) nykwon [MTU and Suprema devices] |
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| {{:en:1x_mtu_001.png?nolink&800|}} | {{:en:1x_mtu_001.png?nolink&800|}} | ||
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| - | Operating systems and network devices automatically negotiate the MTU size. However, the operating system built on some of our Suprema models including BioLite Net, BioEntry Plus, Xpass and Xpass Slim does not support the auto-negotiation feature. We can only control the MSS (maximum segment size) in the TCP header. The MSS set in the TCP header should be lower than the MTU of other network devices. When Suprema devices and the BioStar application are on the same network, the MTU size is usually not an issue. | + | Operating systems and network devices automatically negotiate the MTU size. However, the operating system built on some of our Suprema models including BioLite Net, BioEntry Plus, Xpass, and Xpass Slim does not support the auto-negotiation feature. We can only control the MSS (maximum segment size) in the TCP header. The MSS set in the TCP header should be lower than the MTU of other network devices. When Suprema devices and the BioStar application are on the same network, the MTU size is usually not an issue. |
| But when they are on different networks, especially on the VPN network, the MTU size plays a critical role in the transmission of packets from Suprema devices to the BioStar application. We highly recommend that you set the MTU of your network devices such as VPN devices and routers to be set greater than 1620. \\ \\ | But when they are on different networks, especially on the VPN network, the MTU size plays a critical role in the transmission of packets from Suprema devices to the BioStar application. We highly recommend that you set the MTU of your network devices such as VPN devices and routers to be set greater than 1620. \\ \\ | ||
| - | However, some of our clients should stick to a certain size for some reasons. To deal with those cases, we provide firmware with the smaller MSS (maximum segment size), because the MTU should be dealt on an operating system level and we cannot control it. \\ | + | However, some of our clients should stick to a certain size for some reason. To deal with those cases, we provide firmware with the smaller MSS (maximum segment size), because the MTU should be dealt on an operating system level and we cannot control it. \\ |
| The TCP protocol provides an option field (MSS, maximum segment size) to control the MTU size of the packet, as shown in the figure below: \\ | The TCP protocol provides an option field (MSS, maximum segment size) to control the MTU size of the packet, as shown in the figure below: \\ | ||
| {{:en:1x_mtu_002.png?nolink&800|}} | {{:en:1x_mtu_002.png?nolink&800|}} | ||