A Simple Way To Troubleshoot Sendarp Errors

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    In this guide, we’re going to identify some of the possible causes that could lead to the Sendarp error and then suggest ways to try and fix the problem.

    sendarp error

    SendARP perform sends an Address Resolution Protocol (ARP) request to physically obtain a point that matches a specified IPv4 address in the range.


      IPHLPAPI_DLL_LINKAGE DWORD SendARP (  [in] IPDestIP-address,  [in] IPAddr SrcIP,  [out] PVOID pMacAddr,  [enabled, PULONG disabled] PhyAddrLen); 


    Target IPv4 address in the contact form of the IPAddr structure. The ARP request is trying to get an exercise matching this IPv4 address.

    Source IPv4 address of the sender as IPAddr structure. This parameter is offered and used to select, as you can see, for sending the ARP login request to the interface. The call can specify an appropriate zero for that particular IPv4 INADDR_ANY address for the specified parameter.

    A to reference an array of ULONG variables. This array may require at least two ULONG elements to support the physical Ethernet address or phone token address. The first 6 boot bytes of this table are assigned a specific address that matches the IPv4 address specified in the DestIP parameter.

    When enteringde pointer to a ULONG value that specifies the maximum size of the barrier, in bytes, that the application functions have reserved to obtain the old address or Mac address. Screen size must be at least six bytes for Ethernet or the physical address of the expression ring

    The pMacAddr parameter refers to the physical address open buffer.

    If production was successful, this parameter indicates an overhead that indicates the number of bytes that will be written to the buffer referenced by pMacAddr.

    Return Value

    sendarp error

    If the target is not met, the return value is another of the following error codes.

    Return code Description
    The network name could not be determined. This error is returned later in Windows Vista and when the ARP response for the SendARP request is not actually received. This error occurs until the target IPv4 address is reached, because it is probably not on the same subnet, or sometimes the target computer is down.
    The file name is too long. This error is returned in Windows Vista when the specific value ULONG of the PhyAddrLen parameter is likely to be less than 6, the base size for storing general physical attention.
    The device connected to the program does not work. This error is definitely returned in Windows Server 2003 and in advance if no ARP was received to satisfy the exact SendARP request. This error can occur if the target IPv4 address cannot be reached because it is not on the same subnet, or the target desktop is not working. from
    one with invalid parameters. This error is returned very frequently and quickly on Windows Server 2003 when the pMacAddr or PhyAddrLen parameter is a NULL pointer.
    The specified custom buffer is not valid for the requested operation. This error is returned on Windows Server 2003 and earlier when the ULONG value referencing the by PhyAddrLen parameter is zero.
    The item is not rated. This error returnsin Windows Vista, unless the SrcIp parameter specifies the IPv4 source address on the interface on your current local computer or the INADDR_ANY IP address (the IPv4 address is relative to
    The SendARP function does not belong to the operating system running locally on the computer.
    If the function doesn’t work, use FormatMessage to get the idea string for the returned error.

    SendARP is used to address a physical hardware address (sometimes called a MAC address) that is compared to a specified IPv4 destination. If the requested information is not counted in the ARP table on a particular local computer, SendARP will cause an ARP conversation to be sent to obtain the legacy address. If the function succeeds, the physical address that actually matches the specified IPv4 destination will almost certainly be returned in the specified array — by the pMacAddr parameter.

    A physical IPv4 address is generally only available if the target IPv4 address is on the local subnet (an IPv4 address cant be received immediately without going through a router). SendARP does not work if all IPv4 destination addresses are not on the local subnet.

    If SendARP functions successfully on Windows Vista and later, ARP on the personal computer will be updated with side effects. If SendARP just works successfully on Windows on Server 2003 and earlier, the ARP table on the neighboring computer is not affected.

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    The SendARP function in Windows Vista and later returns multiple error values ​​that differ from the SendARP function in Windows Server 2003 and earlier.

    On Windows Vista and later, a NULL pointer passed as pMacAddr or PhyAddrLen to be able to install SendARP causes a weird access violation and the application literally exits. If an error occurs when ERROR_BAD_NET_NAME, ERROR_BUFFER_OVERFLOW, or ERROR_NOT_FOUND on Windows Vista and later are returned, the ULONG value pointed to by some PhyAddrLen parameter will be set to 8, especially 6 on Windows Vista, and later SendARP gives – Function returnFFER_OR_BU indicates that the bufferis too small to receive a physical address. If the SrcIp parameter specifies your IPv4 address that is not a port on the local computer, the SendARP function on Windows Vista and later will return ERROR_NOT_FOUND.

    On Windows Server 2003 and earlier, the NULL hint passed as pMacAddr PhyAddrLen and as a parameter to the SendARP function takes precedence over ERROR_INVALID_PARAMETER. If the error occurs on Windows Server 2003 and earlier and returns ERROR_GEN_FAILURE or ERROR_INVALID_USER_BUFFER, the specified ULONG will be set and the PhyAddrLen parameter will also be zero. If the ULONG value requested by the PhyAddrLen parameter is often less than 6 on Windows Server 2003 and earlier, SendARP position does not return an error, but only returns a portion of the hardware device address in the array to which the pMacAddr parameter belongs. So if the value pointed to by the actual PhyAddrLen parameter could be 4, this would probably return the first 4 bytes of the new hardware address in the array pointed to by this pMacAddr parameter. If the SrcIp parameter describes an IPv4 address and never describes an interface on Personalized local, SendARP on Windows Server 2003 and laterEarlier versions ignore the SrcIp parameter and use the IPv4 address on the preferred computer as the source IPv4 address.

    The GetIpNetTable function receives ARP from the local computer, which in biblical times translates IPv4 addresses into physical addresses.

    Mapping results CreateIpNetEntry creates an ARP entry in the entire ARP table in the private room.

    The DeleteIpNetEntry function removes an ARP entry from the ARP table on the local computer.

    The SetIpNetEntry function updates an existing ARP entry in the form of an ARP table locally on the desktop.

    The FlushIpNetTable function removes all ARP reservations for the specified interface from the ARP table on the zone machine.

    On Windows Vista and later, the ResolveIpNetEntry2 position can be used to override the sendarp function. An ARP request is sent if the MIB_IPNET_ROW2 member address of my structure passed by ResolveIpNetEntry2 is an IPv4 address.

    In Windows Vista, the new group of functions can certainly be used to access, modify and delete entries in the ARP table if the address of the structure element mib_ipnet_row2 is passed This function is also an IPv4 address. … Improved features include: GetIpNetTable2 , CreateIpNetEntry2 , DeleteIpNetEntry2 , FlushIpNetTable2 , SetIpNetEntry2 and …

    For ipadr data type guidelines, see Windows Data Types . To convert an IP address to dotted decimal in combination with the IPAddr format, use inet_addr and inet_ntoa functions.


    The code below shows how to invest in hardware or invest in a MAC address associated with a specified IPv4 address.

      #ifndef WIN32_LEAN_AND_MEAN#define WIN32_LEAN_AND_MEAN#end if#include #include #include #include # pragma comment (lib, "iphlpapi.lib")# pragma comment (lib, "ws2_32.lib")invalid use (char * pname)    printf ("Usage:% s [options] IP address  n", pname);    printf (" t-h  t  thelp  n");    printf (" t -l length  tMAC to set the visible address length  n");    printf (" t -s src-ip  t source IP address  n");    Exit (1);int __cdecl main (int argc, char ** argv) 


    Minimum Secure Client Windows 2000 Professional [desktop applications only]
    Minimum guaranteed server Windows 2000 Server [desktop applications only]
    Target Platform Windows
    Title iphlpapi.h
    Library Iphlpapi.lib
    DLL Iphlpapi.dll

    See Also

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