# HL7800 as a network interface in Linux

**URL:** <https://forum.sierrawireless.com/t/hl7800-as-a-network-interface-in-linux/20224>\
**Category:** HL78\
**Created:** [May 4, 2020, 9:25am UTC](https://forum.sierrawireless.com/t/hl7800-as-a-network-interface-in-linux/20224 "2020-05-04T09:25:41Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![jesper.persson](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@jesper.persson](https://forum.sierrawireless.com/u/jesper.persson)\
**Post date:** [May 6, 2020, 2:45pm UTC](https://forum.sierrawireless.com/t/hl7800-as-a-network-interface-in-linux/20224/15 "2020-05-06T14:45:01Z")

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Hi,  
I tried upgrading the firmware to the latest version. Now I am getting this error instead:

```auto
pppd[5676]: pppd 2.4.8 started by root, uid 0
chat[5677]: abort on (BUSY)
chat[5677]: abort on (NO CARRIER)
chat[5677]: abort on (VOICE)
chat[5677]: abort on (NO DIALTONE)
chat[5677]: abort on (NO ANSWER)
chat[5677]: abort on (DELAYED)
chat[5677]: timeout set to 10 seconds
chat[5677]: send (AT^M)
chat[5677]: expect (OK)
chat[5677]: AT^M^M
chat[5677]: OK
chat[5677]: -- got it
chat[5677]: send (AT^M)
chat[5677]: expect (OK)
chat[5677]: ^M
chat[5677]: AT^M^M
chat[5677]: OK
chat[5677]: -- got it
chat[5677]: send (ATD*99***1#^M)
chat[5677]: expect (CONNECT)
chat[5677]: ^M
chat[5677]: ATD*99***1#^M^M
chat[5677]: CONNECT
chat[5677]: -- got it
pppd[5676]: Serial connection established.
pppd[5676]: Couldn't set tty to PPP discipline: Invalid argument
pppd[5676]: Exit.

```

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