Merge pull request #1258 from c-po/t4319-disable-ipv6

T4319: bugfixes for disabled IPv6 (current)

1 files changed, 6 insertions, 2 deletions

diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 4fda1c0a9..6b9a4d03e 100755
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -39,7 +39,7 @@ from vyos.util import read_file
 from vyos.util import get_interface_config
 from vyos.util import get_interface_namespace
 from vyos.util import is_systemd_service_active
-from vyos.util import sysctl_read
+from vyos.util import is_ipv6_enabled
 from vyos.template import is_ipv4
 from vyos.template import is_ipv6
 from vyos.validate import is_intf_addr_assigned
@@ -1083,6 +1083,10 @@ class Interface(Control):
 
         addr_is_v4 = is_ipv4(addr)
 
+        # Failsave - do not add IPv6 address if IPv6 is disabled
+        if is_ipv6(addr) and not is_ipv6_enabled():
+            return False
+
         # add to interface
         if addr == 'dhcp':
             self.set_dhcp(True)
@@ -1498,7 +1502,7 @@ class Interface(Control):
         self.set_ipv4_source_validation(value)
 
         # Only change IPv6 parameters if IPv6 was not explicitly disabled
-        if sysctl_read('net.ipv6.conf.all.disable_ipv6') == '0':
+        if is_ipv6_enabled():
             # Configure MSS value for IPv6 TCP connections
             tmp = dict_search('ipv6.adjust_mss', config)
             value = tmp if (tmp != None) else '0'