[Pkg-netmeasure-discuss] scamper sniff: sniff_state_alloc: could not get dl: Success

[Marek Küthe]

Hello,

I am currently trying out some things with Scamper. I wanted to test
`sc_warts2pcap` and wanted to catch some packets with sniff. I used the
following command:
```
$ scamper -O warts -o test.warts -I "sniff -S fd04:234e:fc31:e::21 -c 2
icmp[icmpid] == 1"
```

Where the IP address belongs to a Layer-3 WireGuard interface:
```
$ ip a s dnet
10: dnet: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1400 qdisc noqueue state
UNKNOWN group default qlen 1000 link/none 
    inet 172.22.149.122/32 scope global noprefixroute dnet
       valid_lft forever preferred_lft forever
    inet6 fd04:234e:fc31:e::21/128 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::c302:40cf:a818:c23d/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever
```

However, the program terminates with `[23:50:17:695] sniff_state_alloc:
could not get dl: Success`.

I then tested it with the loopback interface and the IP address `::1`.
This worked. Then I tried my WLAN interface: The program started there,
but did not pick up a packet.
WLAN interface while pinging with tcpdump:
```
23:57:44.475056 lo    In  IP6 ciel > ciel: ICMP6, echo request, id 1,
seq 9, length 64
```
(probably because scamper didn't listen to lo?)

I used `ping -e 1 [IP ADDRESS]` to generate the packets (on the same
machine). As described above, this only worked as desired with `::1`.

```
$ scamper -v
scamper version 20240122
```

Perhaps you could look at the error? I would also be interested to know
what the preferred way is to report such errors?

Regards
Marek Küthe

-- 
Marek Küthe
m.k at mk16.de
er/ihm he/him
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