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Martin Hope
danilo
Asked: 2019-08-25 16:30:27 +0800 CST
  • 9

Is it possible to redirect all calls to an external IP on internet, to localhost (without use of hosts)?

I have an old application and I don't have the source code and this application try to connect to a postgres server using an IP

Can I instruct ubuntu to redirect all callings to this external IP to localhost?

In this way, I'll be able to run a postgres server on localhost and work with my application.

note: the application uses the IP, not the dns.

networking ip tcp-ip
Martin Hope
codemonkey
Asked: 2019-04-06 12:09:34 +0800 CST
  • 6

I am trying to set a static IP for my ubuntu server by creating a yaml file on /etc/netplan/ as follows:

network:
    version: 2
    renderer: networkd        
    ethernets:
        enp0s3:
            dhcp4: no
            addresses: [10.10.21.08/24]
            gateway4: 10.10.21.100

But sudo netplan apply returns an error: 

Error in network definition /etc/netplan/01-netcfg.yaml line 6 column 23: Malformed Address '10.10.21.08/24',  must be X.X.X.X/NN or ... ".
ip netplan
Martin Hope
kimusan
Asked: 2018-08-17 03:41:16 +0800 CST
  • 8

Usually I would be able to change my wifi mac address with the ifconfig command like :

ifconfig <iface> hw ether XX:XX:XX:XX:XX:XX

Ubuntu have however deprecated ifconfig in behalf of the "ip" command, so I was wondering if there is an way to get similar functionality using that command?

networking ifconfig ip
Martin Hope
final20
Asked: 2018-04-29 21:05:47 +0800 CST
  • 45

I've seen some people saying the file to set static ip is still /etc/network/interfaces

And I've seen other people saying that in 18.04 it's now on /etc/netplan (which people seem unhappy about)

I've tried putting this:

version: 2
  renderer: networkd
  ethernets:
    eth0:
      dhcp4: no
      dhcp6: no
      addresses: [192.168.1.9/24]
      gateway4: 192.168.1.1
      nameservers:
        addresses: [192.168.1.1, 8.8.8.8, 8.8.4.4]

In my /etc/netplan/50-cloud-init.yaml and doing sudo netplan apply but that just kills the servers connection to the internet.

networking server ip 18.04
Martin Hope
MasterPorky
Asked: 2014-07-15 15:45:38 +0800 CST
  • 11

I left Ubuntu and came back after a while so I don't remember much. Now I'm trying to get my IP address. All I'm getting from running ifconfig is 

eth0      Link encap:Ethernet  HWaddr 3c:97:0e:11:22:0d  
          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 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:20 Memory:f2500000-f2520000

(BTW, I don't really understand what UP BROADCAST MULTICAST means.)

 $ sudo ifdown eth0 
 ifdown: interface eth0 not configured

Then 

$ sudo ifup eth0
Ignoring unknown interface eth0=eth0

And finally 2: 

$ ip addr show eth0
eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN   
group default qlen 1000 link/ether 3c:97:0e:11:22:0d brd ff:ff:ff:ff:ff:ff
ip