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Enabling this option may break certain setups, e.g. having an alias address(es) | Enabling this option may break certain setups, e.g. having an alias address(es) | ||||
on loopback that are expected to be reachable by outside traffic. | on loopback that are expected to be reachable by outside traffic. | ||||
Enabling some other network features, e.g. | Enabling some other network features, e.g. | ||||
.Xr carp 4 | .Xr carp 4 | ||||
or destination address rewriting | or destination address rewriting | ||||
.Xr pfil 4 | .Xr pfil 4 | ||||
filters may override and bypass this check. | filters may override and bypass this check. | ||||
Disabled by default. | Disabled by default. | ||||
.It Va ip.source_address_validation | |||||
Boolean: perform source address validation for packets destined for the local | |||||
host. | |||||
Consider this as following Section 3.2 of RFC3704/BCP84, where we treat local | |||||
host as our own infrastructure. | |||||
This has no effect on packets to be forwarded, so don't consider it as | |||||
anti-spoof feature for a router. | |||||
Enabled by default. | |||||
.It Va ip.rfc6864 | .It Va ip.rfc6864 | ||||
Boolean: control IP IDs generation behaviour. | Boolean: control IP IDs generation behaviour. | ||||
True value enables RFC6864 support, which specifies that IP ID field of | True value enables RFC6864 support, which specifies that IP ID field of | ||||
.Em atomic | .Em atomic | ||||
datagrams can be set to any value. | datagrams can be set to any value. | ||||
The | The | ||||
.Fx implementation sets it to zero. | .Fx implementation sets it to zero. | ||||
Enabled by default. | Enabled by default. | ||||
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