# Using Custom DNS IP address with RC7620 or RC7620-1

**URL:** <https://forum.sierrawireless.com/t/using-custom-dns-ip-address-with-rc7620-or-rc7620-1/31885>\
**Category:** RC76\
**Created:** [March 21, 2024, 11:48am UTC](https://forum.sierrawireless.com/t/using-custom-dns-ip-address-with-rc7620-or-rc7620-1/31885 "2024-03-21T11:48:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![walter.maina](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@walter.maina](https://forum.sierrawireless.com/u/walter.maina)\
**Post date:** [March 21, 2024, 11:48am UTC](https://forum.sierrawireless.com/t/using-custom-dns-ip-address-with-rc7620-or-rc7620-1/31885/1 "2024-03-21T11:48:57Z")

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Hello Community,

I need some help in understanding whether it is possible to configure the RC7620 or RC7620-1 modem to use a custom DNS IP address instead of the one that is allocated dynamically. So far I have tried the following GPRS connection configurations and they all result in the error **+CME ERROR: 932** which means the format of a parameter is invalid:  
AT+KCNXCFG=1,“GPRS”,“myapn”,“username”,“pswd”,“IPV4V6”,“0.0.0.0”,“8.8.8.8”,“8.8.4.4”,“::”,“::”,“::”  
AT+KCNXCFG=1,“GPRS”,“myapn”,“username”,“pswd”,“IPV4”,“0.0.0.0”,“8.8.8.8”,“8.8.4.4”

I made sure to observe the following rules:  
an active PDP context must have include the following +KCNXCFG configurations:  
· must be consistent with +CGDCONT \<PDP\_type\>, and  
· must be identical to +CGDCONT or must be set to the empty

If I use the following configuration without specifying the DNS IP, I get no error:  
AT+KCNXCFG=1,“GPRS”,“myapn”,“username”,“pswd”,“IPV4V6”,“0.0.0.0”,“0.0.0.0”,“0.0.0.0”,“::”,“::”,“::”

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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:** [March 22, 2024, 5:15am UTC](https://forum.sierrawireless.com/t/using-custom-dns-ip-address-with-rc7620-or-rc7620-1/31885/2 "2024-03-22T05:15:11Z")

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this issue has been reported internally.

you can contact distributor to track the progress.

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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:** [May 31, 2024, 8:12am UTC](https://forum.sierrawireless.com/t/using-custom-dns-ip-address-with-rc7620-or-rc7620-1/31885/4 "2024-05-31T08:12:26Z")

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Please note that static DNS configuration is not supported, that is why you cannot set customer DNS IP address