Hello,
Network question:
I have a computer with two network devices: eth0, eth1
eth0 Link encap:Ethernet
HWaddr 00:02:B3:50:88:D3 inet addr:5.5.5.98 Bcast:5.5.5.255
inet addr:5.5.5.98 Bcast:5.5.5.255 Mask:255.255.255.0
Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth1 Link encap:Ethernet HWaddr 00:02:B3:50:88:D4 inet addr:192.168.1.12
Bcast:192.168.1.63 Mask:255.255.255.192 UP BROADCAST RUNNING MULTICAST
MTU:1500 Metric:1
cat /proc/sys/net/ipv4/ip_forward
0
route:
192.168.1.17 * 255.255.255.255 UH 0 0 0 eth1
192.168.1.16 * 255.255.255.255 UH 0 0 0 eth1
192.168.1.19 * 255.255.255.255 UH 0 0 0 eth1
5.5.5.0 * 255.255.255.0 U 0 0 0 eth0
127.0.0.0 * 255.0.0.0 U 0 0 0 lo
default 5.5.5.1 0.0.0.0 UG 0 0 0 eth0
gateway 5.5.5.1 (Cisco router)
there is a computer in 5.5.5.0
eth0 Link encap:Ethernet HWaddr 00:D0:B7:72:EC:0B
inet addr:5.5.5.138 Bcast:5.5.5.255 Mask:255.255.255.0
UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
route:
5.5.5.0 * 255.255.255.0 U 0 0 0 eth0
loopback localhost 255.0.0.0 UG 0 0 0 lo
default 5.5.5.1 0.0.0.0 UG 0 0 0 eth0
Question: Why pinging 192.168.1.12 from 5.5.5.138 is Ok ?
tcpdump of .12
sudo /usr/sbin/tcpdump -f -i eth0 icmp
tcpdump: listening on eth0
12:41:12.351814 5.5.5.138 > 192.168.1.12: icmp: echo request
12:41:12.351847 192.168.1.12 > 5.5.5.138: icmp: echo reply
Is it right to allow any ip on computer over any device ?
Thanks.
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