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Start your free trialLuis Marsano
21,425 PointsWhy use telnet instead of raw TCP?
Sysadmin/networking guides typically recommend netcat/ncat/socat or TCP device over telnet.
- Telnet is not raw TCP: it does some character handling and can garble data.
- Telnet clients are no longer included with modern OSs.
- According to video, telnet input has a time constraint?
- Telnet is for terminal sessions, not actually meant for raw communication.
In contrast
- The recommended commands send data unaltered.
- ncat is available on POSIX and Windows.
- No additional time constraint.
- General purpose network diagnostics: actually meant for raw communication.
equivalent bash script for TCP device
#!/bin/bash
{
sed -e 's/$/\r/' <<EOF >&3
GET $uri HTTP/1.1
Host: $domain
EOF
cat <&3
} 3<>/dev/tcp/$domain/http
equivalent netcat
nc -C $domain http <<EOF
GET $uri HTTP/1.1
Host: $domain
EOF