Check TCP connectivity
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↑ https://nmap.org/
Using: nping
Install nmap[1] tool, available at least for Windows, Mac and Linux and executenping --tcp -p 3306 172.16.22.218
to test tcp connectivity for port 3306 in host 172.16.22.218:
nping --tcp -p 3306 172.16.22.218 -c 0 Starting Nping 0.6.47 ( http://nmap.org/nping ) at 2019-03-12 09:47 UTC SENT (0.0125s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40 seq=1546620167 win=1480 SENT (1.0127s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40 seq=1546620167 win=1480 RCVD (1.0129s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44 seq=1638376953 win=29200 <mss 1460> SENT (2.0141s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40 seq=1546620167 win=1480 RCVD (2.0143s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44 seq=1654006808 win=29200 <mss 1460> SENT (3.0155s) TCP 172.16.22.18:2734 > 172.16.22.218:3306 S ttl=64 id=56345 iplen=40 seq=1546620167 win=1480 RCVD (3.0157s) TCP 172.16.22.218:3306 > 172.16.22.18:2734 SA ttl=64 id=0 iplen=44 seq=1669652324 win=29200 <mss 1460>
Using nagios: check_tcp
/usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 80
See also
- TCP/IP, Transport protocol, UDP, SCTP, QUIC, subnet mask, Routing protocols: BGP, routing table, Policy based routing, multicast, TCP Fast Open, RDP, TTL, RTT, MPTCP, Large send offload (LSO): (TSO, GRO, GSO, TCP checksum),
ethtool
, SCTP, 5-Tuple, Check TCP connectivity, TCP window size,/proc/sys/net/ipv4/tcp_rmem
, ack, List of TCP ports, localhost, broadcast address ping
,nping
,arping
,fping, gping
,hping
,mtr
,traceroute
,tcptraceroute
,tracepath
,Test-Connection
Powershell cmdlet,iperf
, Ping (PAN-OS), BWPing,check_ping
,ping -M
,ios ping, ping -a
- Ethernet: MII, MDI, bonding, etherchannel, STP, ARP, MAC, STP, Jumbo frames, 802.1X, MTU, Ethernet In-Band Access (IBA), LACP, Multicast, Broadcast, SPI
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