utun interfaces not cleaned up using NetworkExtension

Question

Created Jun ’21

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Aloha. Opening and closing VPN tunnels results in as many utun interfaces as the amount of times the tunnel has been opened. These interfaces stay present and seem to be removed only upon system reboot.

We are using the NetworkExtension as a SystemExtension on macOS to create the virtual interfaces.

Is this the normal behaviour. Has anybody else experienced this?

utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::8038:c353:17cd:c422%utun0 prefixlen 64 scopeid 0xf 
	nd6 options=201<PERFORMNUD,DAD>
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
	inet6 fe80::cfb6:1324:d7e9:5d5%utun1 prefixlen 64 scopeid 0x10 
	nd6 options=201<PERFORMNUD,DAD>
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun7: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
utun8: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300
	options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>

Boost

Answer 1

laszlolaszlo OP

4d

Hello,

I have got similar issue with Cisco Secure Client 5.1.11.388 on macOS 15.7.1 on M4Pro.

ifconfig|grep utun
utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
	inet6 fe80::6235:9250:b189:6812%utun0 prefixlen 64 scopeid 0x10
utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::d6ad:c5bd:89fe:cd10%utun1 prefixlen 64 scopeid 0x11
utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000
	inet6 fe80::6a8:1de7:4b8e:6ccb%utun2 prefixlen 64 scopeid 0x14
utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1000
	inet6 fe80::ce81:b1c:bd2c:69e%utun3 prefixlen 64 scopeid 0x15
utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::69c8:56f6:3119:c115%utun4 prefixlen 64 scopeid 0x16
utun5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::9a32:a1f2:1497:3726%utun5 prefixlen 64 scopeid 0x1c
utun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::4d11:f36d:27fb:f3a3%utun6 prefixlen 64 scopeid 0x1d
utun7: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380
	inet6 fe80::16a1:da58:a01f:df28%utun7 prefixlen 64 scopeid 0x1e

and

netstat -rn|grep default
default            192.168.23.1       UGScg                 en7
default            192.168.23.1       UGScIg                en0
default                                 fe80::a2b5:3cff:fee0:3b04%en7           UGcg                  en7
default                                 fe80::a2b5:3cff:fee0:3b04%en0           UGcIg                 en0
default                                 fe80::%utun0                            UGcIg               utun0
default                                 fe80::%utun1                            UGcIg               utun1
default                                 fe80::%utun2                            UGcIg               utun2
default                                 fe80::%utun3                            UGcIg               utun3
default                                 fe80::%utun4                            UGcIg               utun4
default                                 fe80::%utun5                            UGcIg               utun5
default                                 fe80::%utun6                            UGcIg               utun6
default                                 fe80::%utun7                            UGcIg               utun7

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