# Conditional forwarding subnet - w.x.y.z/26 nicht möglich - CDIR

**URL:** https://discourse.pi-hole.net/t/conditional-forwarding-subnet-w-x-y-z-26-nicht-moglich-cdir/43474
**Category:** Deutschsprachige Hilfe
**Created:** [January 23, 2021, 4:08pm UTC](https://discourse.pi-hole.net/t/conditional-forwarding-subnet-w-x-y-z-26-nicht-moglich-cdir/43474 "2021-01-23T16:08:51Z")
**Posts on this page:** 1
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### Author: ![yubiuser](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/yubiuser/32/12100_2.png) [@yubiuser](https://discourse.pi-hole.net/u/yubiuser)
#### Post date: [January 23, 2021, 4:47pm UTC](https://discourse.pi-hole.net/t/conditional-forwarding-subnet-w-x-y-z-26-nicht-moglich-cdir/43474/2 "2021-01-23T16:47:47Z")

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Das Problem ist, dass `dnsmasq`, die zentrale Komponente von `pihole-FTL` nur `8/16/24` Subnetze zulässt.  
Die Pi-hole Entwickler haben bereits einen Patch an die Entwickler von `dnsmasq` gesendet, der diese Limitation aufhebt, aber leider ist der noch nicht aufgenommen worden.

Siehe auch:

> [@Support prefix /12 for conditonal forwarding](https://discourse.pi-hole.net/t/support-prefix-12-for-conditonal-forwarding/33975):
>
> dnsmasq only supports the following prefix lengths: 8, 16, 24, 32. The line rev-server=172.16.0.0/12,172.16.0.4 specifies a netmark of /12 which is not allowed. This has nothing to do with your last assumption. This is documented in the dnsmasq man page (albeit poorly and only under the option domain): If the address range is given as ip-address/network-size, then a additional flag "local" may be supplied which has the effect of adding local declarations for forward and reverse DNS queries…

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