MTU C819HG-4G-G-K9

[brahim AITBENALI]

Hello,

Do you have any idea about the (max) length of the MTU supported by the C819HG-4G-G-K9 on the air intterface?

the antenna 3G-ANTM-OUT-OM can operate on the frequency range 2100-2200 MHz?

thank you for your help

[mohanak · Accepted solution]

The dynamic Tunnel0 interface will have the IP maximum transmission unit (MTU) of 1476 bytes. IP packets whose lengths exceed 1440 bytes will require fragmentation. For TCP traffic the ip tcp adjust - mss command may be used as shown in this guide to avoid fragmentation

http://www.cisco.com/c/dam/en/us/products/collateral/interfaces-modules/4g-lte-wireless-wan-enhanced-high-speed-wan-interface-card/guide_c07-720264.pdf

[brahim AITBENALI]

Thak you Mohanak, your response affirm my idea about the fragmentation on the network mobile, because to avoid post-fragmentation, the technique says that the maximum MTU size of a mobile user ethernet stack should be that of default ethernet minus the sum of overhead possibilities on existing network. For example, in 3G UMTS networks with Gn interface maximum MTU should be 1492bytes. If the GGSN is to encapsulate the traffic on IPSEC (i.e.Gi corporate network), then it should limite MTU size to ethernet – gn – ipsec (1492-52=1440).

[brahim AITBENALI]

the antenna 3G-ANTM-OUT-OM can operate on the frequency range 2100 MHz?

Yes it oprtates because on the datasheet I found

Operating frequency bands 800/850/900/1800/1900/2100 MHz

http://www.cisco.com/c/en/us/td/docs/routers/access/wireless/hardware/notes/ant3gom.htmlbnande

Frequency bandes

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2100

1920 - 1980

2110 – 2170