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Arp linux add entry

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Содержание
  1. Add arp entry Linux
  2. Arp linux add entry
  3. NAME
  4. SYNOPSIS
  5. DESCRIPTION
  6. MODES
  7. OPTIONS
  8. EXSAMPLES
  9. FILES
  10. SEE ALSO
  11. AUTHORS
  12. DESCRIPTION
  13. MODES
  14. OPTIONS
  15. EXAMPLES
  16. FILES

Add arp entry Linux

Read the question carefully in order to propose a solution, please I need to add permanent arp entry in Linux somehow. The problem is: if I add an entry via shell, or via sockets, it always gets flag 0x6. Even if I use the code posted downhere, where I specify the flag, it remains the same, 0x6. I found this information about 0x6 flag:

Notice the ARP flag of «0x6». The ASIC ARP entry with flag 0x6 is MAC-cache related entry. It is caused by arp lookup failure when installing the session. The session will try to use the source MAC address of incoming packet, but it is not necessary for using this mac address. We can get the MAC address when the reply packet arrives by sending an ARP packet to the source host.

So anytime I add any arp entry, then I ping the same ip address, it always results in ARP request broadcast. The question is, is there a way how to add a permanent ARP entry with proper flag? So I add an entry, and in case of any comunication afterwards, there wont be any ARP broadcast? Btw, to get into what I am up to: I am sending a broadcast(L3) from PC1 containing PC1’s IP and MAC, PC2 gets the packet and add addresses them into ARP table and establish TCP session, but always first run ARP broadcast. via shell:

char *mac_ntoa(unsigned char *ptr) < static char address[30]; sprintf(address, "%02X:%02X:%02X:%02X:%02X:%02X", ptr[0], ptr[1], ptr[2], ptr[3], ptr[4], ptr[5]); return(address); >/* End of mac_ntoa */ int mac_aton(char *addr, unsigned char *ptr) < int i, v[6]; if((i = sscanf(addr, "%x:%x:%x:%x:%x:%x", &v[0], &v[1], &v[2], &v[3], &v[4], &v[5])) !=6)< fprintf(stderr, "arp: invalid Ethernet address '%s'\n", addr); return(1); >/* End of If*/ for(i = 0; i < 6; i++)< ptr[i] = v[i]; >/* End of For */ return(0); > int main(int argc, char* argv[]) < if(argc < 3 || argc >4) < fprintf(stderr,"usage: %s  [temp|pub|perm|trail]\n", argv[0]); fprintf(stderr, "default: temp.\n"); exit(-1); > /* End of If */ int s, flags; char *host = argv[1]; struct arpreq req; struct hostent *hp; struct sockaddr_in *sin; bzero((caddr_t)&req, sizeof(req)); /* caddr_t is not really needed. */ sin = (struct sockaddr_in *)&req.arp_pa; sin->sin_family = AF_INET; sin->sin_addr.s_addr = inet_addr(host); if(sin->sin_addr.s_addr ==-1) < if(!(hp = gethostbyname(host)))< fprintf(stderr, "arp: %s ", host); herror((char *)NULL); return(-1); >/* End of If */ bcopy((char *)hp->h_addr, (char *)&sin->sin_addr, sizeof(sin->sin_addr)); > /* End of If */ if(mac_aton(argv[2], req.arp_ha.sa_data)) < /* If address is valid. */ return(-1); >argc -=2; argv +=2; flags = ATF_PERM | ATF_COM; while(argc-- > 0) < if(!(strncmp(argv[0], "temp", 4)))< flags &= ~ATF_PERM; >else if(!(strncmp(argv[0], "pub", 3))) < flags |= ATF_PUBL; >else if(!(strncmp(argv[0], "trail", 5))) < flags |= ATF_USETRAILERS; >else if(!(strncmp(argv[0], "dontpub", 7))) < /* Not working yet */ flags |= ATF_DONTPUB; >else if(!(strncmp(argv[0], "perm", 4))) < flags = ATF_PERM; >else < flags &= ~ATF_PERM; >/* End of Else*/ argv++; >/* End of While */ req.arp_flags = flags; /* Finally, asign the flags to the structure */ strcpy(req.arp_dev, "eth0"); /* Asign the device. */ if((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)< perror("socket() failed."); exit(-1); >/* End of If */ if(ioctl(s, SIOCSARP, (caddr_t)&req) <0)< /* caddr_t not really needed. */ perror(host); exit(-1); >/* End of If */ printf("ARP cache entry successfully added.\n"); close(s); return(0); >

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Arp linux add entry

NAME

arp - manipulate the system ARP cache

SYNOPSIS

arp [-vn] [-H type] [-i if] [-a] [hostname] arp [-v] [-i if] -d hostname [pub] arp [-v] [-H type] [-i if] -s hostname hw_addr [temp] arp [-v] [-H type] [-i if] -s hostname hw_addr [netmask nm] pub arp [-v] [-H type] [-i if] -Ds hostname ifname [netmask nm] pub arp [-vnD] [-H type] [-i if] -f [filename]

DESCRIPTION

Arp manipulates or displays the kernel's IPv4 network neighbour cache. It can add entries to the table, delete one or display the current content. ARP stands for Address Resolution Protocol, which is used to find the media access control address of a network neighbour for a given IPv4 Address.

MODES

arp with no mode specifier will print the current content of the table. It is possible to limit the number of entries printed, by specifying an hardware address type, interface name or host address. arp -d address will delete a ARP table entry. Root or netadmin priveledge is required to do this. The entry is found by IP address. If a hostname is given, it will be resolved before looking up the entry in the ARP table. arp -s address hw_addr is used to set up a new table entry. The format of the hw_addr parameter is dependent on the hardware class, but for most classes one can assume that the usual presentation can be used. For the Ethernet class, this is 6 bytes in hexadecimal, separated by colons. When adding proxy arp entries (that is those with the publish flag set a netmask may be specified to proxy arp for entire subnets. This is not good practice, but is supported by older kernels because it can be useful. If the temp flag is not supplied entries will be permanent stored into the ARP cache. To simplyfy setting up entries for one of your own network interfaces, you can use the arp -Ds address ifname form. In that case the hardware address is taken from the interface with the specified name.

OPTIONS

-v, --verbose Tell the user what is going on by being verbose. -n, --numeric shows numerical addresses instead of trying to determine symbolic host, port or user names. -H type, --hw-type type When setting or reading the ARP cache, this optional parameter tells arp which class of entries it should check for. The default value of this parameter is ether (i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet). Other values might include network technologies such as ARCnet (arcnet) , PROnet (pronet) , AX.25 (ax25) and NET/ROM (netrom). -a Use alternate BSD style output format (with no fixed columns). -D, --use-device Instead of a hw_addr, the given argument is the name of an interface. arp will use the MAC address of that interface for the table entry. This is usually the best option to set up a proxy ARP entry to yourself. -i If, --device If Select an interface. When dumping the ARP cache only entries matching the specified interface will be printed. When setting a permanent or temp ARP entry this interface will be associated with the entry; if this option is not used, the kernel will guess based on the routing table. For pub entries the specified interface is the interface on which ARP requests will be answered. NOTE: This has to be different from the interface to which the IP datagrams will be routed. NOTE: As of kernel 2.2.0 it is no longer possible to set an ARP entry for an entire subnet. Linux instead does automagic proxy arp when a route exists and it is forwarding. See arp(7) for details. Also the dontpub option which is available for delete and set operations cannot be used with 2.4 and newer kernels. -f filename, --file filename Similar to the -s option, only this time the address info is taken from file filename. This can be used if ARP entries for a lot of hosts have to be set up. The name of the data file is very often /etc/ethers, but this is not official. If no filename is specified /etc/ethers is used as default. The format of the file is simple; it only contains ASCII text lines with a hostname, and a hardware address separated by whitespace. Additionally the pub, temp and netmask flags can be used. In all places where a hostname is expected, one can also enter an IP address in dotted- decimal notation. As a special case for compatibility the order of the hostname and the hardware address can be exchanged. Each complete entry in the ARP cache will be marked with the C flag. Permanent entries are marked with M and published entries have the P flag.

EXSAMPLES

/usr/sbin/arp -i eth0 -Ds 10.0.0.2 eth1 pub This will answer ARP requests for 10.0.0.2 on eth0 with the MAC address for eth1. /usr/sbin/arp -i eth1 -d 10.0.0.1 Delete the ARP table entry for 10.0.0.1 on interface eth1. This will match published proxy ARP entries and permanent entries.

FILES

/proc/net/arp /etc/networks /etc/hosts /etc/ethers

SEE ALSO

rarp(8), route(8), ifconfig(8), netstat(8)

AUTHORS

Fred N. van Kempen waltje@uwalt.nl.mugnet.org>, Bernd Eckenfels net-tools@lina.inka.de>.

Источник

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DESCRIPTION

Arp manipulates or displays the kernel’s IPv4 network neighbour cache. It can add entries to the table, delete one or display the current content.

ARP stands for Address Resolution Protocol, which is used to find the media access control address of a network neighbour for a given IPv4 Address.

MODES

arp with no mode specifier will print the current content of the table. It is possible to limit the number of entries printed, by specifying an hardware address type, interface name or host address.

arp -d address will delete a ARP table entry. Root or netadmin privilege is required to do this. The entry is found by IP address. If a hostname is given, it will be resolved before looking up the entry in the ARP table.

arp -s address hw_addr is used to set up a new table entry. The format of the hw_addr parameter is dependent on the hardware class, but for most classes one can assume that the usual presentation can be used. For the Ethernet class, this is 6 bytes in hexadecimal, separated by colons. When adding proxy arp entries (that is those with the publish flag set) a netmask may be specified to proxy arp for entire subnets. This is not good practice, but is supported by older kernels because it can be useful. If the temp flag is not supplied entries will be permanent stored into the ARP cache. To simplify setting up entries for one of your own network interfaces, you can use the arp -Ds address ifname form. In that case the hardware address is taken from the interface with the specified name.

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OPTIONS

-v, —verbose Tell the user what is going on by being verbose. -n, —numeric shows numerical addresses instead of trying to determine symbolic host, port or user names. -H type, —hw-type type, -t type When setting or reading the ARP cache, this optional parameter tells arp which class of entries it should check for. The default value of this parameter is ether (i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet). Other values might include network technologies such as ARCnet (arcnet) , PROnet (pronet) , AX.25 (ax25) and NET/ROM (netrom). -a Use alternate BSD style output format (with no fixed columns). -e Use default Linux style output format (with fixed columns). -D, —use-device Instead of a hw_addr, the given argument is the name of an interface. arp will use the MAC address of that interface for the table entry. This is usually the best option to set up a proxy ARP entry to yourself. -i If, —device If Select an interface. When dumping the ARP cache only entries matching the specified interface will be printed. When setting a permanent or temp ARP entry this interface will be associated with the entry; if this option is not used, the kernel will guess based on the routing table. For pub entries the specified interface is the interface on which ARP requests will be answered.
NOTE: This has to be different from the interface to which the IP datagrams will be routed. NOTE: As of kernel 2.2.0 it is no longer possible to set an ARP entry for an entire subnet. Linux instead does automagic proxy arp when a route exists and it is forwarding. See arp(7) for details. Also the dontpub option which is available for delete and set operations cannot be used with 2.4 and newer kernels. -f filename, —file filename Similar to the -s option, only this time the address info is taken from file filename. This can be used if ARP entries for a lot of hosts have to be set up. The name of the data file is very often /etc/ethers, but this is not official. If no filename is specified /etc/ethers is used as default.

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The format of the file is simple; it only contains ASCII text lines with a hostname, and a hardware address separated by whitespace. Additionally the pub, temp and netmask flags can be used.

In all places where a hostname is expected, one can also enter an IP address in dotted-decimal notation.

As a special case for compatibility the order of the hostname and the hardware address can be exchanged.

Each complete entry in the ARP cache will be marked with the C flag. Permanent entries are marked with M and published entries have the P flag.

EXAMPLES

/usr/sbin/arp -i eth0 -Ds 10.0.0.2 eth1 pub

This will answer ARP requests for 10.0.0.2 on eth0 with the MAC address for eth1.

/usr/sbin/arp -i eth1 -d 10.0.0.1

Delete the ARP table entry for 10.0.0.1 on interface eth1. This will match published proxy ARP entries and permanent entries.

FILES

/proc/net/arp
/etc/networks
/etc/hosts
/etc/ethers

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