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You should be able ping gateways and DNS of your ISP from instances.

     Sample bellow. Logged into VM via ssh
[root@vf20rs01 ~]# uname -a
Linux vf20rs01.novalocal 3.14.2-200.fc20.x86_64 #1 SMP Mon Apr 28 14:40:57 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
[root@vf20rs01 ~]# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1454
        inet 10.0.0.13  netmask 255.255.255.0  broadcast 10.0.0.255
        inet6 fe80::f816:3eff:fe51:6a34  prefixlen 64  scopeid 0x20<link>
        ether fa:16:3e:51:6a:34  txqueuelen 1000  (Ethernet)
        RX packets 3141  bytes 3137849 (2.9 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2042  bytes 176307 (172.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 0  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Gateway from LAN to Net 192.168.1.1

[root@vf20rs01 ~]# ping -c5  192.168.1.1
PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_seq=1 ttl=63 time=1.88 ms
64 bytes from 192.168.1.1: icmp_seq=2 ttl=63 time=1.26 ms
64 bytes from 192.168.1.1: icmp_seq=3 ttl=63 time=1.38 ms
64 bytes from 192.168.1.1: icmp_seq=4 ttl=63 time=1.21 ms
64 bytes from 192.168.1.1: icmp_seq=5 ttl=63 time=1.76 ms

--- 192.168.1.1 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4007ms
rtt min/avg/max/mdev = 1.213/1.502/1.889/0.274 ms

You should be able ping gateways and DNS of your ISP from instances.

  Sample bellow. Logged into VM via ssh
 [root@vf20rs01 ~]# uname -a
 Linux vf20rs01.novalocal 3.14.2-200.fc20.x86_64 #1 SMP Mon Apr 28 14:40:57 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
 [root@vf20rs01 ~]# ifconfig
 eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1454
         inet 10.0.0.13  netmask 255.255.255.0  broadcast 10.0.0.255
         inet6 fe80::f816:3eff:fe51:6a34  prefixlen 64  scopeid 0x20<link>
         ether fa:16:3e:51:6a:34  txqueuelen 1000  (Ethernet)
         RX packets 3141  bytes 3137849 (2.9 MiB)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 2042  bytes 176307 (172.1 KiB)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
         inet 127.0.0.1  netmask 255.0.0.0
         inet6 ::1  prefixlen 128  scopeid 0x10<host>
         loop  txqueuelen 0  (Local Loopback)
         RX packets 0  bytes 0 (0.0 B)
         RX errors 0  dropped 0  overruns 0  frame 0
         TX packets 0  bytes 0 (0.0 B)
         TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

 Gateway from LAN to Net 192.168.1.1

 [root@vf20rs01 ~]# ping -c5  192.168.1.1
 PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
 64 bytes from 192.168.1.1: icmp_seq=1 ttl=63 time=1.88 ms
 64 bytes from 192.168.1.1: icmp_seq=2 ttl=63 time=1.26 ms
 64 bytes from 192.168.1.1: icmp_seq=3 ttl=63 time=1.38 ms
 64 bytes from 192.168.1.1: icmp_seq=4 ttl=63 time=1.21 ms
 64 bytes from 192.168.1.1: icmp_seq=5 ttl=63 time=1.76 ms

 --- 192.168.1.1 ping statistics ---
 5 packets transmitted, 5 received, 0% packet loss, time 4007ms
 rtt min/avg/max/mdev = 1.213/1.502/1.889/0.274 ms

[root@vf20rs01 ~]# nslookup msn.com
Server:     83.221.202.254
Address:    83.221.202.254#53

Non-authoritative answer:
Name:   msn.com
Address: 65.55.206.228

You should be able ping gateways and DNS of your ISP from instances.

  Sample bellow. Logged into VM via ssh
         [root@vf20rs01 ~]# uname -a
         Linux vf20rs01.novalocal 3.14.2-200.fc20.x86_64 #1 SMP Mon Apr 28 14:40:57 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
         [root@vf20rs01 ~]# ifconfig
         eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1454
                 inet 10.0.0.13  netmask 255.255.255.0  broadcast 10.0.0.255
                 inet6 fe80::f816:3eff:fe51:6a34  prefixlen 64  scopeid 0x20<link>
                 ether fa:16:3e:51:6a:34  txqueuelen 1000  (Ethernet)
                 RX packets 3141  bytes 3137849 (2.9 MiB)
                 RX errors 0  dropped 0  overruns 0  frame 0
                 TX packets 2042  bytes 176307 (172.1 KiB)
                 TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

         lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
                 inet 127.0.0.1  netmask 255.0.0.0
                 inet6 ::1  prefixlen 128  scopeid 0x10<host>
                 loop  txqueuelen 0  (Local Loopback)
                 RX packets 0  bytes 0 (0.0 B)
                 RX errors 0  dropped 0  overruns 0  frame 0
                 TX packets 0  bytes 0 (0.0 B)
                 TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

         Gateway from LAN to Net 192.168.1.1

         [root@vf20rs01 ~]# ping -c5  192.168.1.1
         PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
         64 bytes from 192.168.1.1: icmp_seq=1 ttl=63 time=1.88 ms
         64 bytes from 192.168.1.1: icmp_seq=2 ttl=63 time=1.26 ms
         64 bytes from 192.168.1.1: icmp_seq=3 ttl=63 time=1.38 ms
         64 bytes from 192.168.1.1: icmp_seq=4 ttl=63 time=1.21 ms
         64 bytes from 192.168.1.1: icmp_seq=5 ttl=63 time=1.76 ms

         --- 192.168.1.1 ping statistics ---
         5 packets transmitted, 5 received, 0% packet loss, time 4007ms
         rtt min/avg/max/mdev = 1.213/1.502/1.889/0.274 ms

 [root@vf20rs01 ~]# nslookup msn.com
Server:     83.221.202.254
Address:    83.221.202.254#53
traceroute www.lxer.com
traceroute to www.lxer.com (108.166.170.174), 30 hops max, 60 byte packets
 1  10.0.0.5 (10.0.0.5)  0.779 ms  0.795 ms  0.547 ms <= qdhcp namespace internal gateway
 2  192.168.1.1 (192.168.1.1)  0.975 ms  0.874 ms  0.866 ms <= office gateway
 3  195.214.221.83.static.donpac.com (83.221.214.195)  2.152 ms  2.215 ms  2.476 ms <= ISP Servers
  . . . . . .  Non-authoritative answer:
Name:   msn.com
Address: 65.55.206.228
15  ae-2.r07.dllstx09.us.bb.gin.ntt.net (129.250.3.67)  244.642 ms ae3.cr1.dfw2.us.above.net (64.125.21.129)  192.944 ms ae-2.r07.dllstx09.us.bb.gin.ntt.net (129.250.3.67)  251.929 ms
16  xe-0-0-0-15.r07.dllstx09.us.ce.gin.ntt.net (129.250.195.118)  241.739 ms xe-0-0-0.er3.dfw2.us.above.net (64.125.31.82)  193.563 ms  190.321 ms
17  cust-108-166-160-18.corexchange.com (108.166.160.18)  247.394 ms  241.162 ms  240.694 ms
18  dal4.wmkt.net (108.166.170.174)  240.140 ms xe-5-3-0.core4.dllstx01.corexchange.com (208.78.216.162)  248.958 ms dal4.wmkt.net (108.166.170.174)  239.369 ms