Ethan Brouwer's questions

So I have two servers (davros - working, kraken - not working) on the same subnet (10.10.28.0/24). They both have the same configurations and yet only one of them works. (Also, I should note that they're both VMS on the same KVM instance running Ubuntu 14.04.

To start, here are each of their /etc/network/interfaces files:

# Davros (Working one)

# Interface eth0
auto eth0
iface eth0 inet static
    address <davros_ip_addr>
    netmask 255.255.255.192
    network 192.41.71.192
    broadcast 192.41.71.255
    gateway 192.41.71.193

# Interface eth1
auto eth1
iface eth1 inet static
    address 10.10.28.1
    netmask 255.255.0.0
    network 10.10.0.0
    broadcast 10.10.255.255

and

# Kraken (Broken one)

# Interface eth0
auto eth0
iface eth0 inet static
    address <kraken_ip_addr>
    netmask 255.255.255.192
    network 192.41.71.192
    broadcast 192.41.71.255
    gateway 192.41.71.193

# Interface eth1
auto eth1
iface eth1 inet static
    address 10.10.28.2
    netmask 255.255.0.0
    network 10.10.0.0
    broadcast 10.10.255.255

If you were to diff them, the only thing that's different is their ip addresses.

Next, here's the output of ip addr on both:

# Davros (Working one)

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:87:86:32 brd ff:ff:ff:ff:ff:ff
    inet <davros_ip_addr>/26 brd 192.41.71.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe87:8632/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:13:9d:ad brd ff:ff:ff:ff:ff:ff
    inet 10.10.28.1/16 brd 10.10.255.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe13:9dad/64 scope link 
       valid_lft forever preferred_lft forever

and

# Kraken (Broken one)

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:19:c0:ae brd ff:ff:ff:ff:ff:ff
    inet <kraken_ip_addr>/26 brd 192.41.71.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:fe19:c0ae/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 52:54:00:eb:ef:92 brd ff:ff:ff:ff:ff:ff
    inet 10.10.28.2/16 brd 10.10.255.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::5054:ff:feeb:ef92/64 scope link 
       valid_lft forever preferred_lft forever

Once again, a diff would only show differences in the actual ip addresses.

Here's my route -n output (which is the same on both):

Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.41.71.193   0.0.0.0         UG    0      0        0 eth0
10.10.0.0       0.0.0.0         255.255.0.0     U     0      0        0 eth1
192.41.71.192   0.0.0.0         255.255.255.192 U     0      0        0 eth0

Another thing to clarify, the external network works perfectly fine on both of them. I can ping 8.8.8.8 with no problems. It's just when I try to ping on the local network that kraken (the broken one) fails where davros doesn't.

I've looked all over the place for how to best diagnose this and finally decided I had to ask here. I've been working on this for hours on end. If you need any more information at all, or if you want me to run a command and post the output, please do not hesitate to ask at all. Or clarification. I have no idea what could be causing this. Thank you in advance for any help you give.

I have a few virtualized (ubuntu 14.04 LTS) servers under KVM that I'm trying to move to an ip block other than the one reserved for servers under dhcp (the 10.10.2.0/24 block). I change the ip and then run this command:

sudo ifdown -a && sudo ifup -a

And the whole setup on the new ip works for a little while. Then, after a few minutes, it all of a sudden switches back to wrong ip, even though my /etc/network/interfaces file is unchanged. Here it is:

# Interface lo
auto lo
iface lo inet loopback

# Interface eth0
auto eth0
iface eth0 inet static
    address 10.10.28.4
    netmask 255.255.0.0
    network 10.10.0.0
    broadcast 10.10.255.255
    dns-nameservers 10.10.85.2 10.10.85.71 8.8.8.8
    dns-search lan
    gateway 10.10.85.2

But my ifconfig is changed. I can repeat this over and over, but every time it switches ips (after I do nothing on the server for a bit) and my ssh connection just closes. Any thoughts? What other information might you need to help? Thanks in advance! This is super frustrating!

Edit: Just in case it does help, here's the two ifconfig outputs. After I set the static ip:

eth0      Link encap:Ethernet  HWaddr 52:54:00:51:b8:76  
          inet addr:10.10.28.4  Bcast:10.10.255.255  Mask:255.255.0.0
          inet6 addr: fe80::5054:ff:fe51:b876/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:102914 errors:0 dropped:4 overruns:0 frame:0
          TX packets:31863 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:148249682 (148.2 MB)  TX bytes:4566351 (4.5 MB)

And after it switches back:

eth0      Link encap:Ethernet  HWaddr 52:54:00:51:b8:76  
          inet addr:10.10.2.98  Bcast:10.10.255.255  Mask:255.255.0.0
          inet6 addr: fe80::5054:ff:fe51:b876/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:96960 errors:0 dropped:4 overruns:0 frame:0
          TX packets:29960 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:147748205 (147.7 MB)  TX bytes:4315514 (4.3 MB)

So I have the salt master running on a server in my infrastructure and a few keys sitting there either accepted or unaccepted or... Either rejected or denied. My question is:

What's the difference between rejected or denied keys?:

Denied Keys:
server1
...
Rejected Keys:
server2

Just to let you know, I've done some searching around, and I haven't found anything about what these mean. I keep coming up with results that have to do with completely different stuff.

I have an existing xubuntu server running on my local network. I set up x11vnc and it starts at the login screen, so I can login myself. The only problem is that every time I log in, the vnc connection closes, my vnc viewer (Remmina Remote Desktop Client) window closes, and as soon as I click connect again, I'm back at an empty login screen as if nothing happened. To get it to start before login, I've placed this command in my /etc/rc.local file before the exit 0 command.

#!/bin/bash
x11vnc -xkb -noxrecord -noxfixes -noxdamage -ncache 6 -display :0 -forever -shared -bg -o /var/log/x11vnc.log -rfbport 5901

Why does it disconnect but still allow me to reconnect? Why does it disconnect in the first place? The log shows nothing wrong happening.