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--- утилиты_для_тестирования_сети [2020/04/28 08:29]
val [ping]
+++ утилиты_для_тестирования_сети [2025/05/18 16:50] (current)
val [tcpdump]
@@ Line 7: / Line 7: @@
 <code>
 debian# apt install iputils-ping
+$ ping 1.1.1.1
 $ ping -f gate.isp.un
@@ Line 17: / Line 19: @@
 ===== ARP ping =====
 <code>
-freebsd_sh$ ip=172.16.1.123; ping -c 1 -W 500  $ip >/dev/null ; arp -an | grep $ip
+freebsd_sh$ ip=172.16.1.123; ping -c 1 -W 500  $ip >/dev/null ; arp -an | grep "$ip "
-linux$ ip=172.16.1.254; ping -c 1 -W 1  $ip >/dev/null ; ip n | grep $ip
+linux$ ip=172.16.1.254; ping -c 1 -W 1  $ip >/dev/null ; ip n | grep "$ip "
 </code>
 ===== tcpdump =====
 <code>
-linux# tcpdump	-i any -n
+linux# stdbuf -o0 tcpdump -niany | tee /tmp/log.dmp
 tcpdump	-vn
@@ Line 30: / Line 33: @@
 tcpdump	-nei em0 ether src 00:0c:29:c5:07:8f
-tcpdump	-w file.dump -s0 "port 21 and host 172.16.1.X"
+tcpdump	-w file.pcap -s0 "port 21 and host 172.16.1.X"
-tcpdump	-n -r file.dump -s0 -A
+tcpdump	-n -r file.pcap -s0 -A
 tcpdump	-n ip and 'ip[8]=127'   # ttl
+#https://unix.stackexchange.com/questions/466584/tcpdump-tshark-view-only-outgoing-tcp-connections-requests
+server# tcpdump -i any -nn src host 192.168.X.10 and "tcp[tcpflags] == tcp-syn"
 </code>

Методические материалы Лохтурова Вячеслава