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  6. Tunnel with firewall

Tunnel with firewall

Users can implement a positive security model with Cloudflare Tunnel by restricting traffic originating from cloudflared. The parameters below can be configured for egress traffic inside of a firewall.

​​ Destinations and ports

​​ Global region (default)

Destination Port Protocols
region1.v2.argotunnel.com 7844 TCP/UDP (http2/quic)
region2.v2.argotunnel.com 7844 TCP/UDP (http2/quic)
api.cloudflare.com 443 TCP (HTTPS)
update.argotunnel.com 443 TCP (HTTPS)

​​ US region

If you set the region parameter to US, region1.v2.argotunnel.com and region2.v2.argotunnel.com are replaced with the following:

Destination Port Protocols
us-region1.v2.argotunnel.com 7844 TCP/UDP (http2/quic)
us-region2.v2.argotunnel.com 7844 TCP/UDP (http2/quic)

​​ Test connectivity with dig

To test your connectivity to Cloudflare, you can use the dig command to query the hostnames listed above. Note that cloudflared defaults to connecting with IPv4.


$ dig A region1.v2.argotunnel.com
...
;; ANSWER SECTION:
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.167
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.67
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.57
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.107
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.27
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.7
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.227
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.47
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.37
region1.v2.argotunnel.com. 86400 IN	A	198.41.192.77
...

$ dig AAAA region1.v2.argotunnel.com
...
;; ANSWER SECTION:
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::1
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::2
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::3
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::4
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::5
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::6
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::7
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::8
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::9
region1.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a0::10
...

$ dig A region2.v2.argotunnel.com
...
;; ANSWER SECTION:
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.13
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.193
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.33
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.233
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.53
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.63
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.113
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.73
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.43
region2.v2.argotunnel.com. 86400 IN	A	198.41.200.23
...

$ dig AAAA region2.v2.argotunnel.com
...
;; ANSWER SECTION:
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::1
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::2
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::3
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::4
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::5
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::6
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::7
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::8
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::9
region2.v2.argotunnel.com. 86400 IN	AAAA	2606:4700:a8::10
...

$ dig api.cloudflare.com
...
;; ANSWER SECTION:
api.cloudflare.com.     41      IN      A       104.19.193.29
api.cloudflare.com.     41      IN      A       104.19.192.29
...

$ dig update.argotunnel.com
...
;; ANSWER SECTION:
update.argotunnel.com.	190	IN	A	104.18.32.167
update.argotunnel.com.	190	IN	A	172.64.155.89
...

​​ Test connectivity with PowerShell

On Windows, you can use PowerShell commands if dig is not available.

To test DNS:


PS C:\Windows\system32> Resolve-DnsName -Name _v2-origintunneld._tcp.argotunnel.com SRV


Name                                     Type   TTL   Section    NameTarget                     Priority Weight Port
----                                     ----   ---   -------    ----------                     -------- ------ ----
_v2-origintunneld._tcp.argotunnel.com       SRV    112   Answer     region2.v2.argotunnel.com         2        1      7844
_v2-origintunneld._tcp.argotunnel.com       SRV    112   Answer     region1.v2.argotunnel.com         1        1      7844

To test ports:


PS C:\Cloudflared\bin> tnc region1.v2.argotunnel.com -port 443


ComputerName     : region1.v2.argotunnel.com
RemoteAddress    : 198.41.192.227
RemotePort       : 443
InterfaceAlias   : Ethernet
SourceAddress    : 10.0.2.15
TcpTestSucceeded : True

PS C:\Cloudflared\bin> tnc region1.v2.argotunnel.com -port 7844


ComputerName     : region1.v2.argotunnel.com
RemoteAddress    : 198.41.192.227
RemotePort       : 7844
InterfaceAlias   : Ethernet
SourceAddress    : 10.0.2.15
TcpTestSucceeded : True