Address Resolution Protocol is a layer 2 networking protocol used for resolving layer 3 addresses (such as IP addresses) into layer 2 addresses (such as Ethernet MACs). It is used by network devices when communicating with devices on the same layer 2 network.
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Is there a way to trace what's sending gratuitous arps?
We have a box that's just started acting up and we're not really sure why. It has IP address (dummy examples) 199.199.199.1 on eth0, 127.0.0.2 on eth1, and 199.199.199.2 on eth1:0.
Recently, for some ...
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1answer
63 views
Linux machine does not answer an ARP request
We have this situation: A router, which is an Ubuntu VM, has multiple VLAN interfaces on the same physical NIC. Those VLAN interfaces are dynamically configured and torn down and attached to networks ...
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1answer
273 views
pfSense can't talk ARP beyond a switch two hops away
I have the following devices on vlan93 on my network:
pfsense (192.168.93.1)
core-sw1 (192.168.93.2)
edge-sw1 (192.168.93.3)
pf-switch (192.168.93.100)
devices (192.168.93.120)
Physical ...
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1answer
417 views
How can I configure permanent arp entries on Red Hat Enterprise Linux?
I'm configuring a Red Hat Linux server which will be sending UDP packets out but never receiving ARP responses. So a static ARP entry is required.
The obvious way to do this is.
arp -s 10.0.0.1 ...
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1answer
135 views
Proxy arp and 1:1 NAT
I have a Linux router with 2 NICs doing masquerade from network 192.168.0.0/24 to an ADSL router.
users <----> NIC A [router] NIC B <----> INTERNET
Now I'm experimenting with proxy arp ...
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1answer
203 views
Solaris Slow ARP Failure Unreachable Host
We have been experiencing slow timeouts for unreachable hosts is extremely slow. Recent testing in our lab shows it may be a delay reporting negative ARP lookups. Dumping traffic during attempts to ...
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1answer
853 views
arp -n responds with (incomplete) on the wrong subnet, can't remove it
context
There are 2 servers:
server1 - eth0 10.129.76.16
eth0.2 192.168.0.103
server2 - eth0 10.129.79.1
eth0.2 192.168.62.101
The 192.x.x.x addresses are connected to the ...
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1answer
835 views
How to setup a static multicast ARP entry with Cisco SG300?
We're running a Microsoft NLB cluster in multicast mode as a loadbalancer. Using our old Cisco IOS switches we propagate access to the cluster to our branches using a static ARP entry in the core ...
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1answer
173 views
Adding entries for incoming arp requests to ARP cache?
Given a host A und B within the same broadcast domain whose ARP caches are both empty, under what circumstances would B add an entry for A to its ARP cache when replying to an incoming ARP request ...
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379 views
Direct server return, ARP problem
I'm trying to implement Direct Server Return scheme for our web cluster and I think i got stuck with some ARP issues. For testing purposes I deployed 2 virtual servers (inside ESXi environment).
Host ...
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1answer
298 views
ARP request are sent even though windows has an entry in cache (ARP Table)
we have a product which runs on windows XP embedded SP1. We add a fake(does not exists) MAC address for a fake IP in ARP table. When there is a communication happening Windows sends packets to the ...
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183 views
Dynamic ARP Entries turning into Static ARP entries
I recently acquired a client that has a strange ARP caching issue on one of thier servers.
I have a server that will eventually start turning it's dynamic ARP entries into static ARP entries. This ...
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0answers
419 views
ARP reply vanishes from br0 to tap0 using OpenVPN in bridging mode
i have setup a linux box (on an esxi5) which acts as an openvpn server. the server is configured to use bridging for the clients, which essentially works, with one exception.
if the client pings some ...
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0answers
24 views
Permanant ARP entries become Unresolved
We have a solution where a number of Solaris servers are in a private VLAN and no arp proxies exist in this VLAN, so to reach neighboring servers we must add static arp entries. Each other server in ...
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0answers
94 views
arp reply is not processed
My eth0 interface does not process a legitimate arp reply.
When I try to ping a host, I see arp request and reply with tcpdump from the host I try to ping from, but ip neigh says that there is a ...
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0answers
69 views
Cannot ping any machine on local network (embedded linux device)
I have an embedded linux installation (custom built using buildroot, uClibc and busybox) and I am unable to ping any machine on my local network. My /etc/network/interfaces file is as follows
auto lo
...
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0answers
110 views
openvpn connects but does not work until server pings client
I'm trying to configure a connection using openvpn from a windows 7 client machine to a linux host. I'm using openvpn in the traditional routed mode using tap devices, and the configuration I'm using ...
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0answers
84 views
stop arp poisoning on a 5448 powerconnect switch
We have to disable arp poisoning on our dell 5448 switch. Right now it has all our production machines running on it and I'm not a networking guy at all so I don't want to run a command that will ...
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0answers
61 views
What is the meaning of the QUEUE in arptables
I use the nfqueue target of iptables in order to get packet to the nfqueue and do some business rules on them.
iptables -A INPUT -p tcp -j NFQUEUE --queue-num 0
I need to do the same on arp reply ...
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0answers
346 views
Arp request is not resolved
On my machine, I have assigned ip addresses for two interfaces which are connected through a cable. They are connected with 10G ports.
When i tried to ping the two addresses, ping was not working. ...
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54 views
Server Core DNS Server in VSphere doesn't respond to ping and needs continuous arp clean
I have a VSphere installation hosting two Windows Server 2008 R2 installations. One of them is a complete install that serves as a DHCP server and that I use for administration. The other install is a ...
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207 views
virtualbox bridged adaptor works only guest->host but not host->guest
I have virtualbox 4.1 on a ubuntu 12.04 host. On my host I have a virtual interface eth0:1 configurend as 10.0.1.1. I have a few virtual machines using bridged adapters, configured in the 10.0.1.0 net ...
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180 views
Windows Server 2003 DC sends Gratuitous ARP requests with wrong IP
Hello and excuse me for my English please. ;-)
Two server seems to be involved with this problem. Our DC (domain controller, 2003) an the VMware VC-Server (2008 R2).
After capture "some" network ...
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49 views
Broadcom NetXtreme II GigE Teaming Does Not Use Unique MAC, Causing Collisions
I currently have a new Dell server on my local (inside) network that I have setup to use three of the four nics to create a team. Examples below.
NIC_1 - mac: 000000000001 - ip: n/a
NIC_2 - mac: ...
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45 views
Can't reproduce arp non-response issue with spoofed packets
I'm trying to debug an issue involving a KVM virtual machine instance where the instance doesn't respond to network requests when the source is on another physical machine, which is on the same subnet ...
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36 views
modem arp cache raining on my parade
I have a cable business account with my local provider who uses arp cache in the modem for ip addressing both dynamic and static. with my old dsl I did not have this issue but with Shaw I do.
I'm ...
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245 views
Issue with Cisco ASA 5520, DNS queries and ARP dynamic entries table
I'm having issues with our Cisco ASA 5520. Name resolution queries will stop working every 5 to 10 minutes until the ARP dynamic entries table is cleared. So I can ping 8.8.8.8 but can't ping ...
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383 views
NETKEY IPsec and ARP
I'm wondering if I have the correct routing setup for an IPsec tunnel. I have control over the IPsec endpoints and the hosts connected to one side. These hosts are connecting to the tunnel so that ...
