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docs: fix incorrect info about routed networks
In a recent expansion of the documentation on network forward modes, I incorrectly stated that incoming sessions to guests on routed networks were blocked. This is true for guests on NATed networks, but not routed. This patch corrects that error, and adds a pointer to the nwfilter page for those who do want to restrict incoming sessions to hosts on routed networks.
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@ -134,12 +134,12 @@
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attribute is set, firewall rules will restrict forwarding
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to the named device only. This presumes that the local LAN
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router has suitable routing table entries to return
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traffic to this host. Firewall rules are also installed
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that prevent incoming sessions from the physical network
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to the guests, but outgoing sessions are unrestricted (as
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are sessions from the host to the guests, and between
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guests on the same network.)<span class="since">Since
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0.4.2</span>
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traffic to this host. All incoming and outgoing sessions
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to guest on these networks are unrestricted. (To restrict
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incoming traffic to a guest on a routed network, you can
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configure <a href="formatnwfilter.html">nwfilter rules</a>
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on the guest's interfaces.)
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<span class="since">Since 0.4.2</span>
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</dd>
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<dt><code>bridge</code></dt>
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