實用技巧 通用語法 條件語法: == != > < >= <= in 邏輯語法: && # AND || # OR ! # NOT 常用篩選: type: host, port dir: src, dst proto: tcp, udp, ftp, http SIP 相關 tcpdump timeout 6m tcpdump -i eth0 host -n -s 0 -vvvv -w carrier.pcap Wireshark 更多與 sip 有關的 filter 語法: https://www.wireshark.org/docs/dfref/s/sip.html 只顯示 REGISTER 行,Filter: sip.CSeq.method == REGISTER   其他 遠端監聽指令 ssh root@192.168.0.1 tcpdump -n -i any -w- 'not \( port 22 and host 192.168.0.1 \)' |etherape -r- Filter 速查表 For Cybersecurity