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June 28, 2017 15:31
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Find MTU on Linux as root.
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| #!/bin/sh -x | |
| PL=1500 | |
| myping() { | |
| ping -c1 -w1 -W1 -nM do -s$1 jasan.tk >/dev/null 2>&1 | |
| } | |
| until myping $PL; do PL=$(($PL-10)); done | |
| while PL=$((PL+2)); myping $PL; do : ; done | |
| echo The maximum payload in one packet is $PL | |
| # 28 for IP, 8 for ICMP | |
| echo MTU is $(($PL+28)) |
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