# UDP ports and firewalling

**URL:** <https://www.thethingsnetwork.org/forum/t/udp-ports-and-firewalling/4995>\
**Category:** TTN Network and Services\
**Created:** [January 23, 2017, 4:34pm UTC](https://www.thethingsnetwork.org/forum/t/udp-ports-and-firewalling/4995 "2017-01-23T16:34:59Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![mellbratt](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/mellbratt/32/44781_2.png) [@mellbratt](https://www.thethingsnetwork.org/forum/u/mellbratt)\
**Post date:** [August 21, 2017, 7:01am UTC](https://www.thethingsnetwork.org/forum/t/udp-ports-and-firewalling/4995/15 "2017-08-21T07:01:54Z")

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Depending on which package forwarder you’re using;

1. 1700/udp (legacy/Semtech, incl “connection tracking” in iptables)
2. 1883/tcp + 8883/tcp (MQTT forwarder aka MP packet forwarder) (any other name for this?)
3. 1900/tcp + 1901/tcp (Go forwarder aka the “new packet forwarder” as it’s named in eg. [New TTN Packet Forwarder available](https://www.thethingsnetwork.org/forum/t/new-ttn-packet-forwarder-available/7644))

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