A customer appears to have drastically misunderstood our instructions for connecting to our WAN. He set his PC IP address to the same as one of the bridges. This caused much confusion on the network, to put it mildly. He called to complain about the poor performance of the network he ruined, then made himself unavailable for phone calls so it couldn't be fixed.
Even blocking his MAC address didn't help. The bridging problem happens in midair, nowhere the server can control. If I could at least get into the bridge, I could reconfigure it to a different IP and allow traffic again...
This succeeded in forcing the server to talk to the bridge, not to him. I was then able to get into the bridge's web interface and change its IP from there. From there it was easy.
These 5 Users Gave Thanks to Corona688 For This Post:
How does ARP take care of uniqueness of physical addresses?
How does an ISP allocate a MAC address when I do not have an NIC( Network interface Card)? (1 Reply)
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)
Does ARP Request packet Contains MAC Address of dest during broadcast?
I found It So...
When i captured ARP Req Pkts on ethereal...
Rgds
-Meti (1 Reply)
I was checking nettl output for a unstable telnet to my server. this is part of output:
###
***********************************STREAMS/UX*******************************@#%
Timestamp : Sun Jun 22 EETDST 2008 22:14:47.492899
Process ID : Subsystem ... (4 Replies)
I'm running an arp -an on a Solaris 10 box. We're using IPMP. One of the systems is not able to see a host on the same network. The only difference between the two systems (one is having a problem, the other isn't) at least so far is the output of arp:
# arp -an | grep 224.55
e1000g5... (1 Reply)
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)
About a week ago a customer hooked up a wireless router backwards to our network, causing it to serve incorrect DHCP addresses to some of them. Our networks are mostly statically assigned so this didn't cause as much damage as it might have, but now, over a week later, I still have incomplete... (1 Reply)
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)
Hi, I'm trying to find a way to protect my network against arp spoofing.
What it is:
An attacker sends fake arp packets in the network, identifying himself as the router. All network traffic is then redirected to this attacker.
How to protect myself:
In my opinion, the best possible... (2 Replies)
Hello,
I have 2 clients with Unix installed.
host1: eth0 (192.168.5.10) & eth1 (192.168.10.10)
host2: eth0 (192.168.10.20)
I've connected host1-eth1 to host2-eth0. host1-eth0 isn't connected.
I started 'tcpdump' on wonder that host2 got ARP requests for 192.168.5.10.
Any idea why host1... (2 Replies)
Discussion started by: daWonderer
2 Replies
LEARN ABOUT ULTRIX
arp
arp(8c)arp(8c)Name
arp - address resolution display and control
Syntax
arp -a [vmunix] [kmem]
arp [-d] hostname
arp -f filename
arp -s hostname ether_addr [temp] [pub] [trail]
Description
The program displays and modifies the Internet-to-Ethernet address translation tables used by the address resolution protocol
The hostname is the name of the host system for which information will be displayed or modified.
With no flags, the program displays the current ARP entry for hostname.
Options-a Displays current Address Resolution Protocol (ARP) entries from the specified name list and core files (next arguments). If not spec-
ified, uses and respectively.
-d Deletes the entry for the host specified by name (next argument).
-f Reads information from the specified file (next argument) and modifies entries accordingly. Entries in the file should be of the fol-
lowing form, with argument meanings as given previously:
hostname ether_addr [ temp ] [ pub ] [ trail ]
-s Creates an ARP entry for the host called hostname with the Ethernet address ether_addr. The Ethernet address is given as six hexadec-
imal bytes separated by colons. The entry will be permanent unless the word temp is given in the command. If the word pub is given,
the entry will be published. That is, the system will act as an ARP server, responding to requests for hostname even though the host
address is not its own. The word trail indicates that trailer encapsulations may be sent to this host.
See Alsoarp(4p), ifconfig(8c)arp(8c)
10-22-2012
This caused much confusion on the network, to put it mildly. He called to complain about the poor performance of the network he ruined, then made himself unavailable for phone calls so it couldn't be fixed.