Ping.Send Method (String, Int32, Byte)
Attempts to send an Internet Control Message Protocol (ICMP) echo message with the specified data buffer to the specified computer, and receive a corresponding ICMP echo reply message from that computer. This overload allows you to specify a time-out value for the operation.
Assembly: System (in System.dll)
- Type: System.String
A String that identifies the computer that is the destination for the ICMP echo message. The value specified for this parameter can be a host name or a string representation of an IP address.
- Type: System.Int32
An Int32 value that specifies the maximum number of milliseconds (after sending the echo message) to wait for the ICMP echo reply message.
The size of buffer exceeds 65500 bytes.
hostNameOrAddress is null or is an empty string ("").
buffer is null, or the buffer size is greater than 65500 bytes.
timeout is less than zero.
A call to SendAsync is in progress.
An exception was thrown while sending or receiving the ICMP messages. See the inner exception for the exact exception that was thrown.
This object has been disposed.
When specifying very small numbers for timeout, the Ping reply can be received even if timeout milliseconds have elapsed.
This overload uses default settings for packet fragmentation and packet forwarding. The packet that contains the ICMP echo message can be fragmented in transit if the total packet size exceeds the maximum packet size that can be transmitted by one of the routing nodes between the local and remote computers. To prevent fragmentation, use one of the Send methods that takes an options parameter, and set the DontFragment property to true. When DontFragment is true and the total packet size exceeds the maximum packet size that can be transmitted by one of the routing nodes between the local and remote computers, the ICMP echo request fails. When this happens, the Status is set to PacketTooBig.
The packet or packet fragments can be forwarded by routing nodes 128 times before being discarded. To change this setting, use a Send overload that takes an options parameter, and set the Ttl property to the desired value. If the packet does not reach its destination after being forwarded the specified number of times, the packet is discarded and the ICMP echo request fails. When this happens, the Status is set to TtlExpired.