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---
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{}
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params:
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- mFirewallName
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- mFirewallURL
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---
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import { GlossaryTooltip } from "~/components"
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:::caution
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Internet Control Message Protocol (ICMP) traffic is subject to Magic Firewall rules. If you have Magic Firewall enabled, ensure your rules allow ICMP traffic sourced from Cloudflare public IPs. Otherwise, <GlossaryTooltip term="tunnel health-check">health checks</GlossaryTooltip> will fail. Refer to [Magic Firewall rules](/magic-firewall/about/ruleset-logic/#magic-firewall-rules-and-magic-transit-endpoint-health-checks) for more information.
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Internet Control Message Protocol (ICMP) traffic is subject to Magic Firewall rules. If you have Magic Firewall enabled, ensure your rules allow ICMP traffic sourced from Cloudflare public IPs. Otherwise, <GlossaryTooltip term="tunnel health-check">health checks</GlossaryTooltip> will fail. Refer to <a href={props.mFirewallURL}>{props.mFirewallName}</a> for more information.
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:::

src/content/partials/networking-services/reference/tunnel-health-checks.mdx

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### Rate
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<Render file="icmp-mfirewall" product="networking-services" />
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<Render
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file="icmp-mfirewall"
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product="networking-services"
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params={{
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mFirewallName: "Magic Firewall rules",
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mFirewallURL: "/magic-firewall/about/ruleset-logic/#magic-firewall-rules-and-magic-transit-endpoint-health-checks"
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}}
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/>
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Every Cloudflare data center configured to process your traffic sends tunnel health check probes. The rate at which these health check probes are sent varies based on tunnel and location. This rate can also be tuned up or down on a per tunnel basis by modifying the `health_check` rate of a tunnel with the <a href={props.changeHealthCheckRate}>API or the dash</a>. A customer can set the rate value as _low_, _mid_ or _high_, with _mid_ being the default option. The actual rate formula considers the number of servers in a Cloudflare data center or the number of servers with the customer namespace provisioned on them for dynamically provisioned namespaces. Thus, the rate is not a specific number; it is dynamic and depends on the size of our network.
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src/content/partials/networking-services/routing/configure-tunnels.mdx

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## Add tunnels
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<Render file="icmp-mfirewall" product="networking-services" />
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<Render
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file="icmp-mfirewall"
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product="networking-services"
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params={{
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mFirewallName: "Magic Firewall rules",
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mFirewallURL: "/magic-firewall/about/ruleset-logic/#magic-firewall-rules-and-magic-transit-endpoint-health-checks"
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}}
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/>
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<Tabs syncKey="dashPlusAPI"> <TabItem label="Dashboard">
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