やる側
eth2: 192.168.3.1/24
eth0: 192.168.0.1/24

# ip route
default via 192.168.3.2 dev eth2
192.168.0.0/24 via 203.0.113.2 dev eth0
...
203.0.113.0/24 dev eth0 proto kernel scope link src 203.0.113.1
----
# traceroute -I 192.168.0.2
traceroute to 192.168.0.2 (192.168.0.2), 30 hops max, 60 byte packets
1 192.168.0.2 (192.168.0.2) 1.009 ms 0.989 ms 0.978 ms

~# traceroute -I 203.0.113.2
traceroute to 203.0.113.2 (203.0.113.2), 30 hops max, 60 byte packets
1 203.0.113.2 (203.0.113.2) 1.025 ms 1.005 ms 0.992 ms

いずれも1hop