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"Piggy Backing" Routers

(NB. IP Addresses partially obfuscated.)

Primary Router - WAN port connects to Cable Modem

SumVisionServStatusObs.png
Router's LAN IP address is 192.168.a.4

SumVisionDHCPservObs.png
DHCP Server hands out addresses in the range 192.168.a.31 to 192.168.a.251

SumVisionDHCPlistObs.v01.png
Some addresses are bound to MAC addresses:
00:uu:vv:xx:yy:zz Other Computer
64:uu:vv:xx:yy:zz Wireless Printer
B8:27:EB:xx:yy:zz A Raspberry Pi

NSLU2StaticIPobs.v01.png
NAS Server with manually assigned static address 192.168.a.253
(Outside of the DHCP Server's List)

Secondary Router - WAN port connects to LAN of Primary Router

DLinkLANobs.v01.png
Router's LAN IP address is 192.168.b.2

DLinkStatusDevInfoObs.v01.png
Router's WAN IP address is 192.168.a.139
"Statically" Assigned by Router A's DHCP Server

DLinkDHCPobs.v01.png
DHCP Server hands out addresses in the range 192.168.b.31 to 192.168.b.251

Pinging a Pi via the wired connection to the main Router 'A':

trevor@BlueElf:~$ ping 192.168.a.99 -c 10
PING 192.168.a.99 (192.168.a.99) 56(84) bytes of data.
64 bytes from 192.168.a.99: icmp_req=1 ttl=64 time=1.14 ms
64 bytes from 192.168.a.99: icmp_req=2 ttl=64 time=0.569 ms
64 bytes from 192.168.a.99: icmp_req=3 ttl=64 time=0.616 ms
64 bytes from 192.168.a.99: icmp_req=4 ttl=64 time=0.542 ms
64 bytes from 192.168.a.99: icmp_req=5 ttl=64 time=0.625 ms
64 bytes from 192.168.a.99: icmp_req=6 ttl=64 time=0.545 ms
64 bytes from 192.168.a.99: icmp_req=7 ttl=64 time=0.588 ms
64 bytes from 192.168.a.99: icmp_req=8 ttl=64 time=0.633 ms
64 bytes from 192.168.a.99: icmp_req=9 ttl=64 time=0.572 ms
64 bytes from 192.168.a.99: icmp_req=10 ttl=64 time=0.616 ms

--- 192.168.a.99 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 8998ms
rtt min/avg/max/mdev = 0.542/0.645/1.144/0.169 ms

Associated Traceroute:

traceroute to 192.168.a.99 (192.168.a.99), 30 hops max, 60 byte packets
 1  192.168.a.99 (192.168.a.99)  0.842 ms  1.196 ms  1.145 ms

Pinging the same Pi via the wireless connection to the "Piggy-backed" Router 'B':

trevor@BlueElf:~$ ping 192.168.a.99 -c 10
PING 192.168.a.99 (192.168.a.99) 56(84) bytes of data.
64 bytes from 192.168.a.99: icmp_req=1 ttl=63 time=2.71 ms
64 bytes from 192.168.a.99: icmp_req=2 ttl=63 time=1.82 ms
64 bytes from 192.168.a.99: icmp_req=3 ttl=63 time=1.89 ms
64 bytes from 192.168.a.99: icmp_req=4 ttl=63 time=1.90 ms
64 bytes from 192.168.a.99: icmp_req=5 ttl=63 time=1.90 ms
64 bytes from 192.168.a.99: icmp_req=6 ttl=63 time=2.09 ms
64 bytes from 192.168.a.99: icmp_req=7 ttl=63 time=1.86 ms
64 bytes from 192.168.a.99: icmp_req=8 ttl=63 time=1.91 ms
64 bytes from 192.168.a.99: icmp_req=9 ttl=63 time=1.89 ms
64 bytes from 192.168.a.99: icmp_req=10 ttl=63 time=1.92 ms

--- 192.168.a.99 ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9011ms
rtt min/avg/max/mdev = 1.829/1.993/2.713/0.254 ms

Associated Traceroute:

traceroute to 192.168.a.99 (192.168.a.99), 30 hops max, 60 byte packets
 1  192.168.b.2 (192.168.b.2)  1.611 ms  1.412 ms  2.152 ms
 2  192.168.a.99 (192.168.a.99)  9.977 ms * *



2018-06-16 20:26