hsflowd tries to use the default VRF when an VRF is specified and will fail to start if the addresses is not reachable from the default VRF
VRF interfaces
```
Name State MAC address Flags Interfaces
------- ------- ----------------- ------------------------ --------------------
AS23428 up 06:58:65:b8:30:97 noarp,master,up,lower_up eth0,eth2,tun20,tun0
```
example config
```
set system sflow agent-interface 'tun0'
set system sflow interface 'tun0'
set system sflow sampling-rate '1000'
set system sflow server 2602:fb68:140::2d
set system sflow vrf 'AS23428'
```
```
Feb 11 16:12:44 ix-1 systemd[1]: Started hsflowd.service - Host sFlow.
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(log_backtrace+0x2e)[0x55ab2eaf1cce]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x11ed9)[0x55ab2eaf1ed9]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x3bfd0)[0x7fbaa54fdfd0]
Feb 11 16:12:44 ix-1 ip[162730]: /etc/hsflowd/modules/mod_pcap.so(+0x1954)[0x7fbaa56a6954]
Feb 11 16:12:44 ix-1 ip[162730]: /etc/hsflowd/modules/mod_pcap.so(+0x1d3f)[0x7fbaa56a6d3f]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(EVEventTx+0xf7)[0x55ab2eaf2bb7]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x12d59)[0x55ab2eaf2d59]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x1316a)[0x55ab2eaf316a]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x13340)[0x55ab2eaf3340]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x89044)[0x7fbaa554b044]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x10961c)[0x7fbaa55cb61c]
Feb 11 16:12:44 ix-1 ip[162730]: SIGSEGV, faulty address is (nil)
Feb 11 16:12:44 ix-1 ip[162730]: current bus: packet
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(log_backtrace+0x2e)[0x55ab2eaf1cce]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x11eeb)[0x55ab2eaf1eeb]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x3bfd0)[0x7fbaa54fdfd0]
Feb 11 16:12:44 ix-1 ip[162730]: /etc/hsflowd/modules/mod_pcap.so(+0x1954)[0x7fbaa56a6954]
Feb 11 16:12:44 ix-1 ip[162730]: /etc/hsflowd/modules/mod_pcap.so(+0x1d3f)[0x7fbaa56a6d3f]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(EVEventTx+0xf7)[0x55ab2eaf2bb7]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x12d59)[0x55ab2eaf2d59]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x1316a)[0x55ab2eaf316a]
Feb 11 16:12:44 ix-1 ip[162730]: /usr/sbin/hsflowd(+0x13340)[0x55ab2eaf3340]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x89044)[0x7fbaa554b044]
Feb 11 16:12:44 ix-1 ip[162730]: /lib/x86_64-linux-gnu/libc.so.6(+0x10961c)[0x7fbaa55cb61c]
Feb 11 16:12:44 ix-1 ip[162730]: PCAP: tun0 has no supported datalink encapsulaton
Feb 11 16:12:44 ix-1 ip[162730]: Received signal 11
Feb 11 16:12:44 ix-1 ip[162730]: SIGSEGV, faulty address is (nil)
Feb 11 16:12:44 ix-1 ip[162730]: current bus: packet
Feb 11 16:12:44 ix-1 systemd[1]: hsflowd.service: Main process exited, code=exited, status=11/n/a
Feb 11 16:12:44 ix-1 systemd[1]: hsflowd.service: Failed with result 'exit-code'.
```