I know that we can add arp entry in windows using arp -s IP MAC
I need a command to add such entry for a specific interface if I have many
While I have those two interfaces
Interface: 10.243.16.11 --- 0xe
Interface: 192.168.1.179 --- 0x17
The arp command under Linux has a -i flag for specifying the interface but the Windows one is slightly different.
If you run arp on its own, you'll see how to do it:
ARP -s inet_addr eth_addr [if_addr]
ARP -d inet_addr [if_addr]
ARP -a [inet_addr] [-N if_addr] [-v]
You need to provide the IP address if_addr for the specific interface you want to affect. For example:
C:\Users\Pax>arp -a
Interface: 192.168.0.72 --- 0x1c
Internet Address Physical Address Type
192.168.0.1 80-20-da-a0-f9-3d dynamic
Interface: 172.23.128.1 --- 0x33
Internet Address Physical Address Type
172.23.143.255 ff-ff-ff-ff-ff-ff static
C:\Users\Pax>arp -s 192.90.90.90 80-20-da-a0-f9-33 172.23.128.1
C:\Users\Pax>arp -a
Interface: 192.168.0.72 --- 0x1c
Internet Address Physical Address Type
255.255.255.255 ff-ff-ff-ff-ff-ff static
Interface: 172.23.128.1 --- 0x33
Internet Address Physical Address Type
172.23.143.255 ff-ff-ff-ff-ff-ff static
192.90.90.90 80-20-da-a0-f9-33 static
You can see there that the arp entry has been added to the cache for the specific interface.
Related
I have configured static IP address in /etc/network/interfaces file as below
# The loopback interface
auto lo
iface lo inet loopback
# Wired or wireless interfaces
auto eth0
iface eth0 inet static
address 192.168.1.2
netmask 255.255.255.0
broadcast 192.168.1.255
hwaddress ether 01:06:92:85:00:12
But, when i try to do rmmod of the driver e1000 and then
insmod again. the eth0 network interface would be loaded but, the ip address is not assigned until i explicitly do ifconfig eth0 or ifup eth0.
I have tried adding a script in /etc/network/if-up.d/loadeth.sh
which has
#!/bin/sh
if [ "$IFACE" = eth0 ]; then
echo "eth0 up" >> /var/log/oak_pci.log
fi
but, no luck the IP address is getting assigned.
My aim is that whenever i insmod the ethernet device driver i want to get the network interface(eth0) assigned with static IP address i have assigned in the interfaces file
Could anybody let me know what am i missing here
what am i missing here
The files in /etc/network/ are parsed when when ifup or ifdown commands are executed. (I think also when ifplugd picks them up).
insmod loads a module into the running kernel.
You are missing the knowledge, that there is just no connection between insmod-ing a kernel driver and reading any files from /etc/network directory.
My aim is that whenever i insmod the ethernet device driver i want to get the network interface(eth0) assigned with static IP address i have assigned in the interfaces file
You may setup udev rule to run a custom script upon insmod-ing a kernel driver or when interface comes up.
After going through man page of udev i understood how to create udev rules and with a dummy test specified in this link https://www.tecmint.com/udev-for-device-detection-management-in-linux/ i was able to invoke the udev rules when insmod-ing and rmmod-ing a driver.
So, Here's what i did to automatically set the ip address for the ethernet network interface once driver is loaded or insmoded
I create a udev rules file named 80-net_auto_up.rules in the ethernet pcie driver recipe (it is an out of tree kernel module. Hence, custom recipe)
i added SUBSYSTEM=="net", ACTION=="add", RUN+="/sbin/ifup eth0"
and edited ethernet pcie driver recipe .bb file and added below lines
...
SRC_URI = "all source files of ethernet pcie driver
file://80-net_auto_up.rules \
"
FILES_${PN} += "${sysconfdir}/udev/rules.d/*"
do_install_append() {
...
install -d ${D}${sysconfdir}/udev/rules.d
install -m 0644 ${WORKDIR}/80-net_auto_up.rules ${D}${sysconfdir}/udev/rules.d/
}
and now it works. when i reset the ethernet device manually.
The device is getting detected and Static IP address configured in the /etc/network/interfaces is set
I need some information about routing public IP addresses assigned to the hypervisor into a VM.
I have installed XEN hypervisor on Centos 6.5, I have one NIC with IP 80.86.84.34 & Mask:255.255.255.0 I have an additional IP 85.25.14.195 & Mask: 255.255.255.255
Dom0 has eth0 & virbr0 with a virtual dhcp, the VM has address 192.168.122.4 & Mask:255.255.255.0 the VM has working outbound internet connection.
How do I correctly set dom0 to route connections for 85.25.14.195 into the VM?
Many thanks for your help and apologies if this is a basic question that has been answered before, please point me in the right direction.
First EDIT
I have managed to route the public IP by adding the below route in Dom0, DomU now correctly responds to packets received by Dom0 for the public IP forwarded over virbr0.
route add -net 85.25.14.195 gw 192.168.122.1 netmask 255.255.255.255
My follow up question is what rule is required in IP tables to allow traffic? As currently it is blocked when the firewall is running.
Second EDIT
OK, so I figured out the iptables, I had to remove the REJECT line on virbr0, I also had to add the following rule to make the outbound IP from Dom0 appear correctly:
-A POSTROUTING -s 192.168.122.2 -p tcp -j SNAT --to 85.25.14.195
You should be able to assign 85.25.14.195 as alias IP on virbr0 ( may be virbr0:1 ) and do simple IP Nat or forwarding. You need to do # sysctl -w net.ipv4.ip_forward=1 to be able to forward traffic coming on Public IP to internal Private IP.
I got a problem at the moment and really don't know where the mistake is. I got a Root-Server from my ISP. This Root-Server has already one IP included and today i booked two more IP-Addresses. So what I want to do now is to map this two new IP-Adresses to two virtual Machines but also hold the included IP for the Root-Server. So how I realize this?
I thought something like:
br0 - holds the original IP of the Root-Server
br0:0 - holds first IP of first virtual Machine
br0:1 - holds second IP of second virtual Machine
But this doesn't work. Any Ideas. I'm really frustrated. Worked the hole Day on it and no solution.
I was also struggling with similar scenario, I've got server and got to point that setting up bridge did cut me out and had to restart to be able to reach it , anyway I've managed to handle it by iptables ..
#create alias for your second ip address (lets say its 111.222.333.2 , local address 192.168.1.2)
ifconfig eth0:1 111.222.333.2
#you should add netmask to be proper if you've got subnet
#now you should be able to ping this second address from outside world - try it,
#that is if you have not set up firewall to block pings ... flush iptables rules if you are not sure...
#set up NAT rule (network-address-translate : outside ip-> local ip and back local ip->outside ip)
#assumes your virtual machines lives as 192.168.1.2
iptables -t nat -A PREROUTING -d 111.222.333.2 -j DNAT --to-destination 192.168.1.2
iptables -t nat -A POSTROUTING -s 192.168.1.2 -j SNAT --to-source 111.222.333.2
This did help me with server which has multiple IP addresses and KVM virtual machines,
which were originally run in default network (forward mode=nat), so they had internet through NAT and internal IP at first , this also gives them outside-world public IP address.
You can also do these redirects on port-by-port basis by adjusting iptables rule to set address like -d 111.222.333.2:80 -p tcp and also adding port to local address ...
You may also need to turn on device IP forwarding, you can check that by for example sysctl -a | grep forward (where you should see it on for your eth0 device) , optionally adjusting it by proper sysctl command like
sysctl -w net.ipv4.ip_forward=1
Map br0 to VM1 and VM2 as TAP DEVICE and in VM1 and VM2 you can see that as eth device;
Assign IP1 and IP2 to VM1 and VM2 respectively; With this configuration you can ping from VM1 to VM2 and from host machine to any guest machine(VM1 or VM2);
The following link will help you setting up TAP device for VM via bridge; See qemu-ifup script specified there and understand it well.
While using Fedora 19 on VMware player(Harvard CS50x appliance 19) , the guest OS is not able to access the internet even though the host is .
How to set static Ip address to access Internet ?
First find out your interface using ifconfig
Edit the config file for that interface
using your favorite text editor:
vi /etc/sysconfig/network-scripts/ifcfg-eth1 //where eth1 is your interface
You will need to change BOOTPROTO from dhcp to static and add IPADDR, NETMASK, BROADCAST and NETWORK variables.
NM_CONTROLLED="yes"
BOOTPROTO=static
DEVICE=eth1
ONBOOT=yes
IPADDR=192.168.8.248
NETMASK=255.255.255.0
BROADCAST=192.168.8.255
NETWORK=192.168.8.0
GATEWAY=192.168.8.1
TYPE=Ethernet
PEERDNS=no
Save the file :w !sudo tee % > /dev/null
Also add your DNS servers
vi /etc/resolv.conf
nameserver your_Router_ip
nameserver 8.8.8.8 # Google's DNS Server
You are ready to browse!
What network tool can I use under DOS/windows to find the ip address of a netbios host as easily as is done in Linux?
For example under Linux (ubuntu) I can find the ip address like so:
# nmblookup imac
querying imac on 192.168.1.255
192.168.1.75 imac<00>
Now, this is the IP of the macbook when connected wirelessly
But under windows I can't ping it:
C:\>ping imac
Pinging imac.gateway.2wire.net [192.168.1.68] with 32 bytes of data:
Request timed out.
And the closest tool I could find returns TWO IPs
(it returns the hardwired IP even though it got a different IP by connecting wirelessly
C:\>nslookup imac
Address: 192.168.1.254
Name: imac.gateway.2wire.net
Addresses: 192.168.1.68, 192.168.1.75
Isnt there a windows command to return only the active IP address for the host?
On Windows, you can try
ping -a IP_address (lookup for both DNS name and NetBIOS name)
nslookup IP_address (this command requires you to have an internal DNS server configured)
I like to use ping -a personally.
http://technet.microsoft.com/en-us/library/bb490938.aspx :
Nbtstat.exe -a NETBIOSNAME
Nbtstat.exe -A IP
Come with Windows XP and upward.
nbtstat -a [hostname] -c
This gives IP address of NetBIOS name on Windows