Tun interface not created with this configuration
```
set interfaces tunnel tun0 description '*** SITE1 ***'
set interfaces tunnel tun0 encapsulation 'gre-bridge'
set interfaces tunnel tun0 ip enable-arp-accept
set interfaces tunnel tun0 ip enable-arp-announce
set interfaces tunnel tun0 local-ip '10.0.3.239'
set interfaces tunnel tun0 remote-ip '10.0.32.240'
commit
[ interfaces tunnel tun0 ip enable-arp-accept ]
sh: /proc/sys/net/ipv4/conf/tun0/arp_accept: No such file or directory
[[interfaces tunnel tun0]] failed
Commit failed
```
Tun interface don't created
```
vyos@r-roll# sudo ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:90:b4:a3 brd ff:ff:ff:ff:ff:ff
alias *** GRE-TUNNEL LOCAL-IP INTERFACE ***
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:2b:69:83 brd ff:ff:ff:ff:ff:ff
alias *** GRE-TUNNEL BRIDGE 802.1Q INTERFACE ***
4: eth1.50@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:2b:69:83 brd ff:ff:ff:ff:ff:ff
```
Workaround
```
set interfaces tunnel tun0 description '*** SITE1 ***'
set interfaces tunnel tun0 encapsulation 'gre-bridge'
set interfaces tunnel tun0 local-ip '10.0.3.239'
set interfaces tunnel tun0 remote-ip '10.0.32.240'
commit
set interfaces tunnel tun0 ip enable-arp-accept
set interfaces tunnel tun0 ip enable-arp-announce
commit
```