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-rw-r--r--interface-definitions/vpn_l2tp.xml.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/interface-definitions/vpn_l2tp.xml.in b/interface-definitions/vpn_l2tp.xml.in
index 6cb0d4544..6a88756a7 100644
--- a/interface-definitions/vpn_l2tp.xml.in
+++ b/interface-definitions/vpn_l2tp.xml.in
@@ -37,6 +37,9 @@
<leafNode name="host-name">
<properties>
<help>Sent to the client (LAC) in the Host-Name attribute</help>
+ <constraint>
+ <regex>[A-Za-z0-9][-.A-Za-z0-9]*[A-Za-z0-9]</regex>
+ </constraint>
</properties>
</leafNode>
</children>