# FX30 I cant save the config

**URL:** <https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566>\
**Category:** FX30\
**Created:** [August 2, 2022, 12:59pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566 "2022-08-02T12:59:24Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![a.douma](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@a.douma](https://forum.sierrawireless.com/u/a.douma)\
**Post date:** [August 2, 2022, 12:59pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/1 "2022-08-02T12:59:24Z")

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I put my commands and everything goes well until I turn off and then turn on when I lose everything i did I use Linux any help pls !!

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [August 2, 2022, 1:39pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/2 "2022-08-02T13:39:42Z")

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Do you mean some of the files disappeared?  
How do you power off?  
According to fx30 user guide, you need to trigger pin3.

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**Author:** ![a.douma](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@a.douma](https://forum.sierrawireless.com/u/a.douma)\
**Post date:** [August 2, 2022, 2:03pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/3 "2022-08-02T14:03:48Z")

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echo \> /etc/resolv.conf  
cm data connect & iptables --flush  
iptables -t nat -A POSTROUTING --out-interface rmnet\_data0 -j MASQUERADE  
iptables -A FORWARD -o usb0 -i rmnet\_data0 -m state --state RELATED,ESTABLISHED -j ACCEPT  
iptables -A FORWARD -i usb0 -o rmnet\_data0 -j ACCEPT  
echo 1 \> /proc/sys/net/ipv4/ip\_forward  
cat /etc/resolv.conf

I use this config but when I try to save the file I can’t find the config inside it

my knowledge of Linux is weak so maybe I do something wrong can u tell me the config save steps

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<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [August 2, 2022, 2:46pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/4 "2022-08-02T14:46:14Z")

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Which file are you trying to write?

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<div class="post-metadata">

**Author:** ![a.douma](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@a.douma](https://forum.sierrawireless.com/u/a.douma)\
**Post date:** [August 2, 2022, 5:44pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/5 "2022-08-02T17:44:16Z")

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/etc/resolv.conf this file i try to save it but I don’t find anything inside to save

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<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [August 3, 2022, 12:36am UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/6 "2022-08-03T00:36:28Z")

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you need to use “vi” command to modify the file.

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**Author:** ![cchenry](https://avatars.discourse-cdn.com/v4/letter/c/a183cd/32.png) [@cchenry](https://forum.sierrawireless.com/u/cchenry)\
**Post date:** [August 3, 2022, 3:33pm UTC](https://forum.sierrawireless.com/t/fx30-i-cant-save-the-config/27566/7 "2022-08-03T15:33:29Z")

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Hi @a.douma,  
To add firewall rules, please modify the file “/etc/iptables.rules” directly instead of trying to modify the ‘resolv.conf’ file.

Note, this makes a copy of the iptables riles into the overlay, which can be deleted if the unit is factory reset.

BR,  
Chris