# \[Hilo\] Is there any way to control the MTU during PPP setup?

**URL:** <https://forum.sierrawireless.com/t/hilo-is-there-any-way-to-control-the-mtu-during-ppp-setup/6529>\
**Category:** HL Series FAQ\
**Created:** [July 23, 2013, 3:15am UTC](https://forum.sierrawireless.com/t/hilo-is-there-any-way-to-control-the-mtu-during-ppp-setup/6529 "2013-07-23T03:15:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FAQ\_Poster](https://avatars.discourse-cdn.com/v4/letter/f/f9ae1b/32.png) [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\
**Post date:** [July 23, 2013, 3:15am UTC](https://forum.sierrawireless.com/t/hilo-is-there-any-way-to-control-the-mtu-during-ppp-setup/6529/1 "2013-07-23T03:15:00Z")

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[Hilo] Is there any way to control the MTU (Maximum Transmission Unit) during PPP setup?

Answer: HiloV2 module has its own PPP and TCPIP stack.  
If you’re using TCP/UDP/FTP/HTTP/SMTP/POP3 AT commands, it uses the internal stack. The module does not provide the AT command interface to change the MTU. It’s fixed at 1500 bytes.  
But if you dial up with ATD_99_\*\*1# using the external PPP and TCPIP stack which is embedded in your own u-processor. Then the MTU is possible to change.