07-29-2011
Each packet has a life of its own, but each other sending host will send to the MAC in its ARP cache or first ARP response. Now, if the two cards with one IP are on different collision domains, only one should be ARPing in each collision domain, but if there is a bridge between the two, it might proxy ARP for the other collision domain.
If the IPs are different, then routing tables and software decide which to send a packet out on. If the interfaces are not full duplex, sometimes the net is set up to flow packets out one and back on the other (asymetric routing), which messes up with NAT if it comes to a dfferent firewall.
For high performance and reliability, sometimes the basics are complicated by special software to load balance and expedite avoiding breakdowns.
This User Gave Thanks to DGPickett For This Post:
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
HI,
When I do 'service network restart' , I am getting the following error.
"3c501 device eth0 does not seem to be present, delaying initialization"
Can any one suggest me the cause/solution for this?
When I do 'lspci' it is showing the ehternet card as
" Ethernet controller"Marvell... (2 Replies)
Discussion started by: praveen_b744
2 Replies
2. Linux
Hi
I had a DL380 with two two port eth cards. I now replaced one with a four port eth card and my interfaces seemed to have jumped around.
Is there a method of moving eth ports... eg making port eth4 eth2.:confused: (2 Replies)
Discussion started by: theroncj
2 Replies
3. UNIX for Dummies Questions & Answers
folks;
This might sounds stupid but i hope someone can give me an answer:
On my Linux SUSE boxes, i have 2 NIC cards NIC1 & NIC2. I always assumed that NIC1 is eth0 when i run "ifconfig" and NIC2 is eth1
but i noticed that's not always the case.
Is there a way or a command i can run to find... (1 Reply)
Discussion started by: Katkota
1 Replies
4. UNIX for Advanced & Expert Users
Hi,
For one of my application(Linux 2.6) I am using a netlink socket to get the interface changes notification.
socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE)
Application receives netlink notification for Ethernet, bond interfaces but there is no notification about bridge interfaces changes. ... (6 Replies)
Discussion started by: learn more
6 Replies
5. IP Networking
Hello everybody,
I have been reading many posts about this topic but I have no figure out how to solve it.
I need to split the traffic incoming on eth0 on two other interfaces (for instance one receiving on port 80 and the others on the other interface).
I cannot understand how to do that.... (2 Replies)
Discussion started by: nicandro
2 Replies
6. Shell Programming and Scripting
I want to run dhcpclient for all the eth* which has no ip
for example
eth0 Link encap:Ethernet HWaddr 00:1E:67:3E:BA:EF
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0... (6 Replies)
Discussion started by: yanglei_fage
6 Replies
7. Linux
Hi all,
OS: fedora release 10
when i try to restart network service, ending up with following errors. There are two interfaces eth0 and eth1
bringing up interface eth0 rtnetlink answers file exists
error adding <IP Address here> to eth0
bringing up interface eth0 rtnetlink answers... (2 Replies)
Discussion started by: lramsb4u
2 Replies
8. Red Hat
Hi,
I´ve given only this info to configure a network interface : "port 1 PCI 4"
I´ve been searching for any kind of relationship in the system which allow me to find the etc that must be configured...
Please, could anybody help me?
rhxx:#/root# lspci |grep -i "PCI BRIDGE"
00:01.0 PCI... (0 Replies)
Discussion started by: pabloli150
0 Replies
9. UNIX for Dummies Questions & Answers
hi guys
I have a server which has 2 nics eth0 and eth1
eth0 is used for our email traffic server. everything working fine
some time later a eth1 was added for backup purposes so this new nic sends data to another vlan for backup purposes
all of a sudden our mail server starts to fail... (3 Replies)
Discussion started by: karlochacon
3 Replies
10. IP Networking
Server is stuck at "Stuck at "bringing up interface eth0:""
after i hard reset the server
I have IPMI access, please help me diagnose the cause if you can :( (0 Replies)
Discussion started by: postcd
0 Replies
LEARN ABOUT DEBIAN
send_arp
SEND_ARP(8) System Manager's Manual SEND_ARP(8)
NAME
send_arp - Send out one ARP packet with source/target IP and Ethernet hardware addresses suuplied by the user.
SYNOPSIS
send_arp sndr_ip_addr sndr_hw_addr targ_ip_addr targ_hw_addr [src_int [src_hw_addr [dest_hw_addr]]]
DESCRIPTION
send_arp This program sends out one ARP packet with source/target IP and Ethernet hardware addresses suuplied by the user. It compiles and
works on Linux and will probably work on any Unix that has SOCK_PACKET.
The idea behind this program is a proof of a concept, nothing more. It comes as is, no warranty. However, you're allowed to use it under
one condition: you must use your brain simultaneously. If this condition is not met, you shall forget about this program and go RTFM imme-
diately.
OPTIONS
sndr_ip_addr
Sender IP address for ARP packet.
sndr_hw_addr
Sender Hardware address for ARP packet.
targ_ip_addr
Target IP address for ARP packet.
targ_hw_addr
Target Hardware address for ARP packet.
src_int
Source Interface for ARP packet.
src_hw_addr
Source layer2 Hardware address for ARP packet.
dest_hw_addr
Destination layer2 Hardware address for ARP packet.
AUTHORS
send_arp - Yuri Volobuev <volobuev@t1.chem.umn.edu>
man page - Horms <horms@verge.net.au>
layer2 patch - Patrick Koppen <patrick@koppen.de>
30th October 2003 SEND_ARP(8)