![]() The option affects only timeout in absense of any responses, otherwise ping waits for two RTTs. W timeout Time to wait for a response, in seconds. In this case ping does not stopĪfter count packet are sent, it waits either for deadline expire or until count probes are answered or for some error notification from w deadline Specify a timeout, in seconds, before ping exits regardless of how many packets have been sent or received. Normally ping prints network round trip time, which can be different f.e. U Print full user-to-user latency (the old behaviour). Locally when packet size is large), or dont (do not set DF flag). hint may be either do (prohibit fragmentation, even local one), want (do PMTU discovery, fragment M hint Select Path MTU Discovery strategy. Tsprespec host1 ]] (timestamp prespecified hops). timestamp option may be either tsonly (only timestamps), tsandaddr (timestamps and addresses) or T timestamp option Set special IP timestamp options. If not specified, it is selected to buffer not more than one packet. The default is 56, which translates into 64 ICMP data bytes when combined with the 8 bytes of ICMP header s packetsize Specifies the number of data bytes to be sent. This option can be used to ping a local host through an interface that has no route through it provided the option -I is also used. If the host is not on a directly-attached network, an error is r Bypass the normal routing tables and send directly to a host on an attached interface. Many hosts ignore or discard this option. Includes the RECORD_ROUTE option in the ECHO_REQUEST packet and displays the route buffer on returned packets. Nothing is displayed except the summary lines at startup time and when finished. Services (DS), consisting of: bits 0-1 of separate data (ECN will be used, here), and bits 2-7 of Differentiated Services Codepoint (DSCP). In RFC2474, these fields has been redefined as 8-bit Differentiated You cannot set bit 0x01 (reserved) unless ECN has been enabled in the kernel. You must be root (CAP_NET_ADMIN capability) to use Critical or higher precedence Possible settingsįor special Precedence range from priority (0x20) to net control (0xe0). Multiple TOS bits should not be set simultaneously. Service are: minimal cost: 0x02, reliability: 0x04, throughput: 0x08, low delay: 0x10. Interpreted as: 0 for reserved (currently being redefined as congestion control), 1-4 for Type of Service and 5-7 for Precedence. Q tos Set Quality of Service -related bits in ICMP datagrams. p ff will cause the sent packet to be filled with all ones. This is useful for diagnosing data-dependent problems in a network. p pattern You may specify up to 16 ''pad'' bytes to fill out the packet you send. No attempt will be made to lookup symbolic names for host addresses. This flag only applies if the ping destination is a multicast address. L Suppress loopback of multicast packets. Only the super-user may select preload more than 3. l preload If preload is specified, ping sends that many packets not waiting for reply. When pinging IPv6 link-local address this option Argument may be numeric IP address or name of device. I interface address Set source address to specified interface address. Only super-user may set interval to values less 0.2 seconds. The default is to wait for one second between each packet normally, or not to wait in flood mode. i interval Wait interval seconds between sending each packet. Only the super-user may use this option with zero interval. If interval is not given, it sets interval to zero and outputs packets as fast as they come back or one hundred times For every ECHO_REQUEST sent a period ''.'' is printed, while for ever ECHO_REPLY received a backspace is printed. If value is zero, kernel allocates random flow label. F flow label Allocate and set 20 bit flow label on echo request packets. Essentially, this socket option is not used by Linux kernel. d Set the SO_DEBUG option on the socket being used. With deadline option, ping waits for count ECHO_REPLY packets, until the timeout c count Stop after sending count ECHO_REQUEST packets. The address is bound to one selected when ping starts. B Do not allow ping to change source address of probes. On networks with low rtt this mode is essentially equivalent to flood mode. Minimal interval is 200msec for not super-user. Interpacket interval adapts to round-trip time, so that effectively not more than one (or more, if preload is set) unanswered probes present (''pings'') have an IP and ICMP header, followed by a struct timeval and then an arbitrary number of ''pad'' bytes used to fill out the packet. Ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from a host or gateway.
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