I have a working code that displays an entry from a given IP address. but, how can i display the entire ARP table? like the option 'arp -a' of the standard linux program.
This is the code:
I've looked to /usr/src/linux/net/ipv4/arp.c code before posting and can't find anything that tells me how to do it.
Dear all,
We are testing two of our servers for mq series connectivity. The scenario is, when one machine is shutting down it's services there are some scripts that do a dns update, which removes the ip address and relates it to the ip address of the other node on our dns server, and the update... (7 Replies)
Dear All
i have a linux proxy server which has RHEL-5 64 bit, it has two interfaces, it has the following details
eth0=10.200.14.42
eth3=10.201.14.42
default gateway=10.201.14.254
one static route=192.168.0.0/24 gw 10.200.14.254
i am facing a problem when i ping 10.201.14.42 from... (2 Replies)
Dear Friends,
Am an newbie to this domain. I have a table which is filled with contents which i need to be updated with,so am trying to design a flow which would read the data from the table and mail it to me at regular intervals. I could make out the flow using mailx command but want to... (3 Replies)
Man page of netlink says:
---------------------------------
NETLINK_ARPD
For managing the arp table in user space.
----------------------------------
Is it possible to monitor arp table using Netlink? or it's just for manipulating? (1 Reply)
Hi
The below script working when we are sending the html as attachment can u please guide how to send thesmae data in table form direct in the mail and not in mail attachment .
cat Employee.sql
SET VERIFY OFF
SET PAGESIZE 200
SET MARKUP HTML ON SPOOL ON PREFORMAT OFF ENTMAP ON -
HEAD... (0 Replies)
Can someone please explain this output to me. Why doesn't ifconfig show the same info?
~ $ arp -a
? (10.71.0.1) at 00:1b:21:2b:eb:0c on eth0 (4 Replies)
I am writing some portable code to print Interface, its IP address, and its MAC (Hardware) address. It is working on three platforms (viz, Linux, Solaris and HP-UX). However, it is creating problems on AIX.
The code is as follows:
Now the problem is that when I try to execute the... (1 Reply)
My script gives the following result. Is it possible to display the same in table format ?
1.
rex_best
Latest feeds are not avaialable. The last feed was generated on 2012-05-17
File Name = ekb_best_20120517_010949_665.tar.gz
The Number of entry elements = 4209539
2.
rex_genre
Latest... (2 Replies)
I want to search a small string in a large string and find the locations of the string. For this I used grep "string" -ob <file name where the large string is stored>. Now this gives me the locations of that string. Now how do I store these locations in a text file.
Please use CODE tags as... (7 Replies)
Discussion started by: ANKIT ROY
7 Replies
LEARN ABOUT ULTRIX
arp
arp(4p)arp(4p)Name
arp - Address Resolution Protocol
Syntax
pseudo-device ether
Description
The ARP protocol is used to map dynamically between DARPA Internet and 10Mb/s Ethernet addresses. It is used by all the 10Mb/s Ethernet
interface drivers.
The ARP protocol caches Internet-Ethernet address mappings. When an interface requests a mapping for an address not in the cache, ARP
queues the message which requires the mapping and broadcasts a message on the associated network requesting the address mapping. If a
response is provided, the new mapping is cached and any pending messages are transmitted. The ARP protocol queues only the most recently
``transmitted'' packet while waiting for a mapping request to be responded to.
To enable communications with systems which do not use ARP, ioctls are provided to enter and delete entries in the Internet-to-Ethernet
tables. The usage is:
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
struct arpreq arpreq;
ioctl(s, SIOCSARP, (caddr_t)&arpreq);
ioctl(s, SIOCGARP, (caddr_t)&arpreq);
ioctl(s, SIOCDARP, (caddr_t)&arpreq);
Each ioctl takes the same structure as an argument. SIOCSARP sets an ARP entry, SIOCGARP gets an ARP entry, and SIOCDARP deletes an ARP
entry. These ioctls may be applied to any socket descriptor s, but only by the superuser. The arpreq structure contains:
/*
* ARP ioctl request
*/
struct arpreq {
struct sockaddr arp_pa; /* protocol address */
struct sockaddr arp_ha; /* hardware address */
int arp_flags; /* flags */
};
/* arp_flags field values */
#define ATF_COM 2 /* completed entry (arp_ha valid) */
#define ATF_PERM 4 /* permanent entry */
#define ATF_PUBL 8 /* publish (respond for other host) */
The address family for the arp_pa sockaddr must be AF_INET; for the arp_ha sockaddr, it must be AF_UNSPEC. The only flag bits that can be
written are ATF_PERM and ATF_PUBL. ATF_PERM causes the entry to be permanent if the ioctl call succeeds. The ioctl may fail if more than
four permanent Internet host addresses hash to the same slot. ATF_PUBL specifies that the ARP code should respond to ARP requests for the
indicated host coming from other machines. This lets a SUN act as an ARP server, which can be used to make an ARP-only machine talk to a
non-ARP machine.
The ARP protocol watches passively for a host that responds to an ARP mapping request for the local host's address.
Restrictions
ARP packets on the Ethernet use only 42 bytes of data. The smallest legal Ethernet packet is 60 bytes, however, not including CRC. Some
systems may not enforce the minimum packet size.
Diagnostics
duplicate IP address!! sent from Ethernet address: %x:%x:%x:%x:%x:%x
ARP has discovered another host on the local network that responds to mapping requests for its own Internet address.
See Alsoinet(4f), arp(8c), ifconfig(8c)arp(4p)