Share internet access with route

Question

I'm trying to share internet connection of a linux machine with another machine.

Both created in vmbox, PC A has a internal network connection, PC B has both an internal and external connection. Dhcpd of vmbox is enabled for internal network, both systems get their internal network IP from this.

PC A -> 10.10.10.2 PC B -> 10.10.10.4 (internal) + 10.0.3.15(external)

net.ipv4.ip_forward = 1 and IPtables are disabled in both machines. Machines can ping each other, PC B can ping internet

PC A ->

route add default gw 10.10.10.4

PC B ->

route add default gw 10.0.3.15

traceroute from PC A ends with timeout at PC B. For some reasong PC B does not forward the traffic

score 0 · Answer 1 · answered Oct 27 '16 at 12:22

0

on pc b:

iptables -A POSTROUTING -t nat -j MASQUERADE

answered Oct 27 '16 at 12:22

Ipor Sircer

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I want to understand why route is not working. Thank you for the info – Kartop Kus Oct 27 '16 at 12:26
because external (10.0.3.15) doesn't know where to answer back to 10.10.10.2 – Ipor Sircer Oct 27 '16 at 12:27
So this task is not possible with route alone? – Kartop Kus Oct 27 '16 at 12:33
add a route on 10.0.3.15, too. – Ipor Sircer Oct 27 '16 at 12:42
It is not possible with route alone, you need SNAT / MASQUERADE here. – Tero Kilkanen Oct 27 '16 at 14:37
On PC B you need this too: net.ipv4.ip_forward = 1 – Fredi Oct 27 '16 at 15:35

Share internet access with route

1 Answers1