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T7723: dhcp-server add DHCP Option 26 #4666

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T7723: dhcp-server add DHCP Option 26 #4666

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46b7141
Changes to support DHCP option 26 (client interface mtu)
mzpqnxow Aug 18, 2025
5fc7ec8
fix type for interface-mtu
mzpqnxow Aug 29, 2025
1bb88d8
use minimum MTU specified in RFC 790 as the lower bound
mzpqnxow Aug 29, 2025
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12 changes: 12 additions & 0 deletions interface-definitions/include/dhcp/option-v4.xml.i
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,18 @@
</constraint>
</properties>
</leafNode>
<leafNode name="interface-mtu">
<properties>
<help>Interface MTU</help>
<valueHelp>
<format>u16:576-9000</format>
<description>Client interface MTU</description>
</valueHelp>
<constraint>
<validator name="numeric" argument="--range 576-9000"/>
</constraint>
</properties>
</leafNode>
<leafNode name="ip-forwarding">
<properties>
<help>Enable IP forwarding on client</help>
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1 change: 1 addition & 0 deletions python/vyos/kea.py
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Expand Up @@ -45,6 +45,7 @@
'ipv6_only_preferred': 'v6-only-preferred',
'captive_portal': 'v4-captive-portal',
'capwap_controller': 'capwap-ac-v4',
'interface_mtu': 'interface-mtu',
}

kea6_options = {
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7 changes: 7 additions & 0 deletions smoketest/scripts/cli/test_service_dhcp-server.py
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Expand Up @@ -225,6 +225,7 @@ def test_dhcp_single_pool_options(self):
server_identifier = bootfile_server
ipv6_only_preferred = '300'
capwap_access_controller = '192.168.2.125'
interface_mtu = '1420'

pool = base_path + ['shared-network-name', shared_net_name, 'subnet', subnet]
self.cli_set(pool + ['subnet-id', '1'])
Expand All @@ -233,6 +234,7 @@ def test_dhcp_single_pool_options(self):
self.cli_set(pool + ['option', 'name-server', dns_1])
self.cli_set(pool + ['option', 'name-server', dns_2])
self.cli_set(pool + ['option', 'domain-name', domain_name])
self.cli_set(pool + ['option', 'interface-mtu', interface_mtu])
self.cli_set(pool + ['option', 'ip-forwarding'])
self.cli_set(pool + ['option', 'smtp-server', smtp_server])
self.cli_set(pool + ['option', 'pop-server', smtp_server])
Expand Down Expand Up @@ -365,6 +367,11 @@ def test_dhcp_single_pool_options(self):
['Dhcp4', 'shared-networks', 0, 'subnet4', 0, 'option-data'],
{'name': 'ip-forwarding', 'data': 'true'},
)
self.verify_config_object(
obj,
['Dhcp4', 'shared-networks', 0, 'subnet4', 0, 'option-data'],
{'name': 'interface-mtu', 'data': interface_mtu},
)

# Time zone
self.verify_config_object(
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