| title | description | services | author | ms.service | ms.topic | ms.date | ms.author | ms.custom |
|---|---|---|---|---|---|---|---|---|
include file |
include file |
firewall |
vhorne |
firewall |
include |
06/02/2022 |
victorh |
include file |
| Resource | Limit |
|---|---|
| Data throughput | 30 Gbps |
| Rule limits | 10,000 unique source/destinations in network and application rules |
| Total size of rules within a single Rule Collection Group | 2 MB |
| Number of Rule Collection Groups in a firewall policy | 50 |
| Maximum DNAT rules | 298 (for firewalls configured with a single Public IP address) The DNAT limitation is due to the underlying platform. The maximum number of DNAT rules is 298. However, any additional public IP addresses reduce the number of the available DNAT rules. For example, two public IP addresses allow for 297 DNAT rules. If a rule's protocol is configured for both TCP and UDP, it counts as two rules. |
| Minimum AzureFirewallSubnet size | /26 |
| Port range in network and application rules | 1 - 65535 |
| Public IP addresses | 250 maximum. All public IP addresses can be used in DNAT rules and they all contribute to available SNAT ports. |
| IP addresses in IP Groups | Maximum of 100 IP Groups per firewall. Maximum 5000 individual IP addresses or IP prefixes per each IP Group. |
| Route table | By default, AzureFirewallSubnet has a 0.0.0.0/0 route with the NextHopType value set to Internet. Azure Firewall must have direct Internet connectivity. If your AzureFirewallSubnet learns a default route to your on-premises network via BGP, you must override that with a 0.0.0.0/0 UDR with the NextHopType value set as Internet to maintain direct Internet connectivity. By default, Azure Firewall doesn't support forced tunneling to an on-premises network. However, if your configuration requires forced tunneling to an on-premises network, Microsoft will support it on a case by case basis. Contact Support so that we can review your case. If accepted, we'll allow your subscription and ensure the required firewall Internet connectivity is maintained. |
| FQDNs in network rules | For good performance, do not exceed more than 1000 FQDNs across all network rules per firewall. |