# Discovery

## Problem

I feel something tickling me, what is it?

## Solution

The description says that something is "tickling" me. It turns out that this was referring to network tickling. When I connected to the VPN, `tcpdump` showed that `10.35.2.134` is periodically pinging me.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-062fb53f2bd865554eb7479e0350c9e689e29915%2Fbd5e57f434a24f6a8b169bbc11038da5.png?alt=media)

Let's open this in Wireshark to inspect the packet contents. The flag is in the ICMP data.

![](https://3167364547-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MX1bWRlBzHpEPe1TYDD%2Fuploads%2Fgit-blob-c770e2a6c7fb69770f1b1d04e8ba8bdc3b98b03d%2F2b5c82c82ee444f6ade47365d15f9e57.png?alt=media)