method Socket.prototype.setTTL
Usage in Deno
```typescript import { Socket } from "node:node__dgram.d.ts"; ```
Socket.prototype.setTTL(ttl: number): number
Sets the `IP_TTL` socket option. While TTL generally stands for "Time to Live",
in this context it specifies the number of IP hops that a packet is allowed to
travel through. Each router or gateway that forwards a packet decrements the
TTL. If the TTL is decremented to 0 by a router, it will not be forwarded.
Changing TTL values is typically done for network probes or when multicasting.
The `ttl` argument may be between 1 and 255\. The default on most systems
is 64.
This method throws `EBADF` if called on an unbound socket.
number