FireBrick Firewall - Steam Client

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This firewall allows both inbound and outbound traffic to reach the steam client, all other traffic is rejected. It is written for gaming systems that will only be using the steam client.

Static DNS

Static DNS manages control over which IP's the steam client can use:

<dns resolvers="2001:8b0::2020 2001:8b0::2021 217.169.20.20 217.169.20.21">
<host name="api.steampowered.com" ip="23.205.213.78"/>
<host name="cdn.akamai.steamstatic.com" ip="23.63.98.26 23.63.98.32"/>
<host name="cdn.store.steampowered.com" ip="23.63.98.26 23.63.98.32"/>
<host name="cgpromotion.azurewebsites.net" ip="104.40.183.236"/>
<host name="cgpromotion.blob.core.windows.net" ip="168.61.57.78"/>
<host name="clientconfig.akamai.steamstatic.com" ip="23.63.98.26 23.63.98.32"/>
<host name="crash.steampowered.com" ip="208.64.203.140 208.64.203.173"/>
<host name="crl4.digicert.com" ip="66.225.197.197"/>
<host name="dreamfallchapters.azurewebsites.net" ip="191.238.8.26"/>
<host name="images.akamai.steamusercontent.com" ip="23.63.98.26 23.63.98.32"/>
<host name="media.steampowered.com" ip="23.63.98.26 23.63.98.32"/>
<host name="media2.steampowered.com" ip="205.185.216.10 205.185.216.42"/>
<host name="media3.steampowered.com" ip="8.253.70.30 8.253.70.110"/>
<host name="media4.steampowered.com" ip="23.63.98.26 23.63.98.32"/>
<host name="ocsp.digicert.com" ip="93.184.220.29"/>
<host name="paypal.d1.sc.omtrdc.net" ip="66.235.148.64"/>
<host name="repo.steampowered.com" ip="23.63.98.26 23.63.98.32"/>
<host name="s1.symcb.com" ip="2.22.133.163"/>
<host name="s2.symcb.com" ip="2.22.139.27"/>
<host name="steamcdn-a.akamaihd.net" ip="23.67.255.200 23.67.255.208"/>
<host name="steamcloud-eu.storage.googleapis.com" ip="216.58.198.208 216.58.198.240"/>
<host name="steamcloudams.blob.core.windows.net" ip="168.61.58.14"/>
<host name="steamclouddub.blob.core.windows.net" ip="191.235.193.40"/>
<host name="steamcommunity-a.akamaihd.net" ip="23.63.99.219 23.67.255.202"/>
<host name="steamcommunity.com" ip="23.63.99.219 23.67.255.202"/>
<host name="steamstore-a.akamaihd.net" ip="23.63.99.208 23.63.99.240"/>
<host name="store.akamai.steamstatic.com" ip="23.63.98.26 23.63.98.32"/>
<host name="store.steampowered.com" ip="23.205.213.78"/>
<host name="t.paypal.com" ip="173.223.190.173"/>
<host name="www.paypal.com" ip="173.223.190.173"/>
<host name="www.paypalobjects.com" ip="23.65.43.145"/>
</dns>

Firewall

Outbound Rules - Change the MAC address in the source-mac= element to your own:

<rule-set name="Steam Client: Outbound" source-interface="LAN" target-interface="pppoe" no-match-action="continue">
  <rule name="Steam OS: NTP"
        target-port="123"
        protocol="17"
        action="accept"/>
  <rule name="Steam Client: TCP"
        target-port="27014-27050"
        protocol="6"
        action="accept"/>
  <rule name="Steam Client: UDP"
        target-port="3478 4379 4380 27000-27030"
        protocol="17"
        action="accept"/>
  <rule name="CDN: Akamai"
        target-ip="23.32.0.0/11 23.64.0.0/14 23.192.0.0/12 92.122.0.0/15 104.64.0.0/10 173.223.176.0/20"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="CDN: Highwinds"
        target-ip="205.185.216.10 205.185.216.42"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="CDN: Level 3"
        target-ip="8.253.70.30 8.253.70.110"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="Steam Cloud: Amazon Web Services"
        target-ip="54.231.130.0/23 54.231.132.0/22 54.231.136.0/22 54.231.140.0/23 54.231.142.0/24"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="Steam Cloud: Google Cloud Platform"
        target-ip="216.58.198.208 216.58.198.240"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="Steam Cloud: Microsoft Azure"
        target-ip="104.40.183.236 168.61.57.78 168.61.58.14 191.235.193.40 191.238.8.26"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="PayPal Payments"
        target-ip="2.22.133.163 2.22.139.27 23.65.43.145 66.225.197.197 66.235.148.64 93.184.220.29 173.223.190.173"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="Valve Software"
        target-ip="103.10.124.0/23 146.66.155.0/24 155.133.224.0/19 162.254.192.0/21 205.196.6.0/24 208.64.200.0/22"
        target-port="80 443"
        protocol="6"
        action="accept"/>
  <rule name="Deny All"
        source-mac="D8CB8AA2464E"
        action="reject"/>
</rule-set>

Inbound Rules - Change the IP address in the target-ip= element to your own:

<rule-set name="Steam Client: Inbound" target-interface="LAN" no-match-action="reject">
<rule name="Allow Firebrick" source-interface="self"/>
<rule name="Steam Client: TCP" target-ip="217.169.11.114/31" target-port="27014-27050" protocol="6" action="accept"/>
<rule name="Steam Client: UDP" target-ip="217.169.11.114/31" target-port="3478 4379 4380 27000-27030" protocol="17" action="accept"/>
</rule-set>

Technical Notes

Steam's game delivery system uses 3 different high performing CDN companies: Akamai, Highwinds and Level 3.

  • media.steampowered.com = Akamai
  • media2.steampowered.com = Highwinds
  • media3.steampowered.com = Level 3
  • media4.steampowered.com = Akamai

Origin Server

The origin server is where each CDN will pull files from. The origin server hostnames are:

  • cdn-01-origin.steampowered.com
  • cdn-01.steampowered.com

Steam Client

This documents what hostnames the steam client uses and when.

On startup:

  • repo.steampowered.com
  • client-download.steampowered.com
  • media.steampowered.com (Randomly Selected)
  • media2.steampowered.com (Randomly Selected)
  • media3.steampowered.com (Randomly Selected)
  • media4.steampowered.com (Randomly Selected)
  • api.steampowered.com
  • clientconfig.akamai.steamstatic.com
  • steamcommunity-a.akamaihd.net
  • store.steampowered.com
  • cdn.akamai.steamstatic.com
  • steamcommunity.com
  • br01.broadcast.fra.steamstatic.com (Randomly Selected)
  • br01.broadcast.lax.steamstatic.com (Randomly Selected)
  • br01.broadcast.lon.steamstatic.com (Randomly Selected)
  • br01.broadcast.ord.steamstatic.com (Randomly Selected)
  • br01.broadcast.sto.steamstatic.com (Randomly Selected)
  • br02.broadcast.fra.steamstatic.com (Randomly Selected)
  • br02.broadcast.lax.steamstatic.com (Randomly Selected)
  • br02.broadcast.lon.steamstatic.com (Randomly Selected)
  • br02.broadcast.ord.steamstatic.com (Randomly Selected)
  • br02.broadcast.sto.steamstatic.com (Randomly Selected)
  • br03.broadcast.fra.steamstatic.com (Randomly Selected)
  • br03.broadcast.lax.steamstatic.com (Randomly Selected)
  • br03.broadcast.lon.steamstatic.com (Randomly Selected)
  • br03.broadcast.ord.steamstatic.com (Randomly Selected)
  • br03.broadcast.sto.steamstatic.com (Randomly Selected)
  • br04.broadcast.fra.steamstatic.com (Randomly Selected)
  • br04.broadcast.lax.steamstatic.com (Randomly Selected)
  • br04.broadcast.lon.steamstatic.com (Randomly Selected)
  • br04.broadcast.ord.steamstatic.com (Randomly Selected)
  • br04.broadcast.sto.steamstatic.com (Randomly Selected)

Entering the Store:

  • store.steampowered.com
  • store.akamai.steamstatic.com

Exploring your Queue:

  • store.steampowered.com
  • cdn.akamai.steamstatic.com

PayPal Payments:

  • store.steampowered.com
  • ocsp.digicert.com
  • crl4.digicert.com
  • www.paypal.com
  • s2.symcb.com
  • s1.symcb.com
  • www.paypalobjects.com
  • paypal.d1.sc.omtrdc.net
  • t.paypal.com

Steam Cloud

The steam cloud stores a copy of local saved games, allowing you to use them on another system running the steam client. Here is a list of which hostnames belong to which game:

Deponia: The Complete Journey

  • cgpromotion.azurewebsites.net
  • cgpromotion.blob.core.windows.net

Deponia Doomsday

  • cgpromotion.azurewebsites.net
  • cgpromotion.blob.core.windows.net

Dreamfall Chapters

  • dreamfallchapters.azurewebsites.net
  • steamcloud-dub.s3.amazonaws.com

IP Reference

This documents what range of IP's belong to which CDN node and steam hostname.

cdn.akamai.steamstatic.com:
cdn.store.steampowered.com:
clientconfig.akamai.steamstatic.com:
images.akamai.steamusercontent.com:
media.steampowered.com:
media4.steampowered.com:
repo.steampowered.com:
store.akamai.steamstatic.com:

  • a1507.d.akamai.net
  • 23.63.98.26 (Primary)
  • 23.63.98.32 (Primary)
  • 23.63.98.10
  • 23.63.98.17
  • 23.63.98.18
  • 23.63.98.19
  • 23.63.98.27
  • 23.63.98.33
  • 23.63.98.41
  • 23.63.98.43
  • 23.63.99.58
  • 23.63.99.90
  • 104.86.110.249
  • 104.86.111.137

steamcommunity-a.akamaihd.net:

  • a1697.g.akamai.net
  • 23.63.99.219 (Primary)
  • 23.67.255.202 (Primary)
  • 104.86.110.24
  • 104.86.110.75

steamstore-a.akamaihd.net:

  • a1737.g.akamai.net
  • 23.63.99.208 (Primary)
  • 23.63.99.240 (Primary)
  • 104.86.110.24
  • 104.86.110.81

steamcdn-a.akamaihd.net:

  • a1843.g.akamai.net
  • 23.67.255.200 (Primary)
  • 23.67.255.208 (Primary)
  • 104.86.110.27
  • 104.86.110.35