Binding a /22 Subnet in Ubuntu 16 not working


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Binding a /22 Subnet in Ubuntu 16 not working

I'm trying to add *secondary* subnet, a /22 in Ubuntu 16 but the IPs don't ping despite proper routing at the switch level. **How do I properly bind the secondary /22 subnet (IPv4) and have these IPs ping?**

I can ping locally, but not from external. Below commands didn't work.

Code:
root@server:~# iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
root@server:~# iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT

Routing at the Cisco switch level is fine too:

Code:
interface Vlan100
 description Server xxx
 ip address xxx.xxx.16.1 255.255.252.0 secondary
 ip address xxx.xxx.105.41 255.255.255.248


/etc/network/interfaces shows something like this...

Code:
    # This file describes the network interfaces available on your system
    # and how to activate them. For more information, see interfaces(5). source /etc/network/interfaces.d/*

    # The loopback network interface
    auto lo
    iface lo inet loopback

    # The primary network interface
    auto eno1
    iface eno1 inet static
        address xxx.xxx.105.42
        netmask 255.255.255.248
        network xxx.xxx.105.40
        broadcast xxx.xxx.105.47
        gateway xxx.xxx.105.41
        # dns-* options are implemented by the resolvconf package, if installed
        dns-nameservers 8.8.8.8 8.8.4.4
        dns-search mydomain.com

iface eno1 inet static
  address XXX.XXX.16.0/22

Code:
root@server:~# ifconfig |more
eno1      Link encap:Ethernet  HWaddr d4:be:d9:ed:fb:8a  
          inet addr:xxx.xxx.xxx.42  Bcast:xxx.xxx.xxx.47  Mask:255.255.255.248
          inet6 addr: fe80::d6be:d9ff:feed:fb8a/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:7386 errors:0 dropped:0 overruns:0 frame:0
          TX packets:457 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:478778 (478.7 KB)  TX bytes:467117 (467.1 KB)

eno1:0    Link encap:Ethernet  HWaddr d4:be:d9:ed:fb:8a  
          inet addr:xxx.xxx.16.1  Bcast:xxx.xxx.19.255  Mask:255.255.252.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

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Net::DBus::Binding::Bus(3pm)				User Contributed Perl Documentation			      Net::DBus::Binding::Bus(3pm)

NAME
Net::DBus::Binding::Bus - Handle to a well-known message bus instance SYNOPSIS
use Net::DBus::Binding::Bus; # Get a handle to the system bus my $bus = Net::DBus::Binding::Bus->new(type => &Net::DBus::Binding::Bus::SYSTEM); DESCRIPTION
This is a specialization of the Net::DBus::Binding::Connection module providing convenience constructor for connecting to one of the well- known bus types. There is no reason to use this module directly, instead get a handle to the bus with the "session" or "system" methods in Net::DBus. METHODS
my $bus = Net::DBus::Binding::Bus->new(type => $type); my $bus = Net::DBus::Binding::Bus->new(address => $addr); Open a connection to a message bus, either a well known bus type specified using the "type" parameter, or an arbitrary bus specified using the "address" parameter. If the "private" parameter is set to a true value, then a private connection to the bus is obtained. The caller must explicitly disconnect this bus instance before releasing the last instance of the object. $bus->request_name($service_name) Send a request to the bus registering the well known name specified in the $service_name parameter. If another client already owns the name, registration will be queued up, pending the exit of the other client. my $name = $bus->get_unique_name Returns the unique name by which this processes' connection to the bus is known. Unique names are never re-used for the entire lifetime of the bus daemon. $bus->add_match($rule) Register a signal match rule with the bus controller, allowing matching broadcast signals to routed to this client. $bus->remove_match($rule) Unregister a signal match rule with the bus controller, preventing further broadcast signals being routed to this client AUTHOR
Daniel P. Berrange COPYRIGHT
Copyright (C) 2004-2011 Daniel P. Berrange SEE ALSO
Net::DBus::Binding::Connection, Net::DBus perl v5.14.2 2011-06-30 Net::DBus::Binding::Bus(3pm)

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