· 8 years ago · Oct 23, 2016, 01:38 PM
1# ping -I eth1 my.remote-server.com
2PING my.remote-server.com (X.X.X.X) from 10.1.1.12 eth1: 56(84) bytes of data.
3^C
4--- my.remote-server.com ping statistics ---
513 packets transmitted, 0 received, 100% packet loss, time 12094ms
6
7# tcpdump -i eth1 -qtln icmp
8tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
9listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
10IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 7, length 64
11IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 8, length 64
12IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 8, length 64
13IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 9, length 64
14IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 9, length 64
15IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 10, length 64
16IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 10, length 64
17IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 305, seq 11, length 64
18IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 305, seq 11, length 64
19^C
209 packets captured
219 packets received by filter
220 packets dropped by kernel
23
24# tcpdump -i eth2 -qtln icmp
25tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
26listening on eth2, link-type EN10MB (Ethernet), capture size 65535 bytes
27IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 213, length 64
28IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 213, length 64
29IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 214, length 64
30IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 214, length 64
31IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 215, length 64
32IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 215, length 64
33IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 216, length 64
34IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 216, length 64
35IP 192.168.1.10 > X.X.X.X: ICMP echo request, id 360, seq 217, length 64
36IP X.X.X.X > 192.168.1.10: ICMP echo reply, id 360, seq 217, length 64
37^C
3810 packets captured
3910 packets received by filter
400 packets dropped by kernel
41
42# tcpdump -i eth0 -qtln icmp
43tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
44listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes
45IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 1, length 64
46IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 1, length 64
47IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 2, length 64
48IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 2, length 64
49IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 3, length 64
50IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 3, length 64
51IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 4, length 64
52IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 4, length 64
53IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 5, length 64
54IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 5, length 64
55IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 6, length 64
56IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 6, length 64
57IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 7, length 64
58IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 7, length 64
59IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 8, length 64
60IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 8, length 64
61IP Y.Y.Y.Y > X.X.X.X: ICMP echo request, id 360, seq 9, length 64
62IP X.X.X.X > Y.Y.Y.Y: ICMP echo reply, id 360, seq 9, length 64
63
6418 packets captured
65228 packets received by filter
6692 packets dropped by kernel
67
68# ifconfig
69eth1 Link encap:Ethernet HWaddr 94:0c:6d:82:0d:98
70 inet addr:10.1.1.1 Bcast:10.1.1.255 Mask:255.255.255.0
71 inet6 addr: fe80::960c:6dff:fe82:d98/64 Scope:Link
72 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
73 RX packets:105761 errors:0 dropped:0 overruns:0 frame:0
74 TX packets:48944 errors:0 dropped:0 overruns:0 carrier:0
75 collisions:0 txqueuelen:1000
76 RX bytes:40298768 (38.4 MiB) TX bytes:44831595 (42.7 MiB)
77 Interrupt:19 Base address:0x6000
78
79eth2 Link encap:Ethernet HWaddr 6c:f0:49:a4:47:38
80 inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
81 inet6 addr: fe80::6ef0:49ff:fea4:4738/64 Scope:Link
82 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
83 RX packets:38335992 errors:0 dropped:0 overruns:0 frame:0
84 TX packets:37097705 errors:0 dropped:0 overruns:0 carrier:1
85 collisions:0 txqueuelen:1000
86 RX bytes:4260680226 (3.9 GiB) TX bytes:3759806551 (3.5 GiB)
87 Interrupt:27
88
89eth3 Link encap:Ethernet HWaddr 94:0c:6d:82:c8:72
90 UP BROADCAST MULTICAST MTU:1500 Metric:1
91 RX packets:0 errors:0 dropped:0 overruns:0 frame:0
92 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
93 collisions:0 txqueuelen:1000
94 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
95 Interrupt:20 Base address:0x2000
96
97lo Link encap:Local Loopback
98 inet addr:127.0.0.1 Mask:255.0.0.0
99 inet6 addr: ::1/128 Scope:Host
100 UP LOOPBACK RUNNING MTU:16436 Metric:1
101 RX packets:3408 errors:0 dropped:0 overruns:0 frame:0
102 TX packets:3408 errors:0 dropped:0 overruns:0 carrier:0
103 collisions:0 txqueuelen:0
104 RX bytes:358445 (350.0 KiB) TX bytes:358445 (350.0 KiB)
105
106tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
107 inet addr:10.8.0.1 P-t-P:10.8.0.2 Mask:255.255.255.255
108 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1
109 RX packets:2767779 errors:0 dropped:0 overruns:0 frame:0
110 TX packets:1569477 errors:0 dropped:0 overruns:0 carrier:0
111 collisions:0 txqueuelen:100
112 RX bytes:3609469393 (3.3 GiB) TX bytes:96113978 (91.6 MiB)
113
114
115# route -n
116Kernel IP routing table
117Destination Gateway Genmask Flags Metric Ref Use Iface
11810.8.0.2 0.0.0.0 255.255.255.255 UH 0 0 0 tun0
119127.0.0.1 0.0.0.0 255.255.255.255 UH 0 0 0 lo
12010.8.0.0 10.8.0.2 255.255.255.0 UG 0 0 0 tun0
121192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth2
12210.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
1230.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth2
124
125# arp -n
126# Note: Here I have changed all the different MACs except the ones corresponding to the Ubuntu box (on 10.1.1.12 and 192.168.1.12)
127Address HWtype HWaddress Flags Mask Iface
128192.168.1.118 ether NN:NN:NN:NN:NN:NN C eth2
129192.168.1.72 ether NN:NN:NN:NN:NN:NN C eth2
130192.168.1.94 ether NN:NN:NN:NN:NN:NN C eth2
131192.168.1.102 ether NN:NN:NN:NN:NN:NN C eth2
13210.1.1.12 ether 00:1e:67:15:2b:f0 C eth1
133192.168.1.86 ether NN:NN:NN:NN:NN:NN C eth2
134192.168.1.2 ether NN:NN:NN:NN:NN:NN C eth2
135192.168.1.61 ether NN:NN:NN:NN:NN:NN C eth2
136192.168.1.64 ether NN:NN:NN:NN:NN:NN C eth2
137192.168.1.116 ether NN:NN:NN:NN:NN:NN C eth2
138192.168.1.91 ether NN:NN:NN:NN:NN:NN C eth2
139192.168.1.52 ether NN:NN:NN:NN:NN:NN C eth2
140192.168.1.93 ether NN:NN:NN:NN:NN:NN C eth2
141192.168.1.87 ether NN:NN:NN:NN:NN:NN C eth2
142192.168.1.92 ether NN:NN:NN:NN:NN:NN C eth2
143192.168.1.100 ether NN:NN:NN:NN:NN:NN C eth2
144192.168.1.40 ether NN:NN:NN:NN:NN:NN C eth2
145192.168.1.53 ether NN:NN:NN:NN:NN:NN C eth2
146192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth2
147192.168.1.83 ether NN:NN:NN:NN:NN:NN C eth2
148192.168.1.89 ether NN:NN:NN:NN:NN:NN C eth2
149192.168.1.12 ether 00:1e:67:15:2b:f1 C eth2
150192.168.1.77 ether NN:NN:NN:NN:NN:NN C eth2
151192.168.1.66 ether NN:NN:NN:NN:NN:NN C eth2
152192.168.1.90 ether NN:NN:NN:NN:NN:NN C eth2
153192.168.1.65 ether NN:NN:NN:NN:NN:NN C eth2
154192.168.1.41 ether NN:NN:NN:NN:NN:NN C eth2
155192.168.1.78 ether NN:NN:NN:NN:NN:NN C eth2
156192.168.1.123 ether NN:NN:NN:NN:NN:NN C eth2
157
158
159# iptables -L -n
160Chain INPUT (policy ACCEPT)
161target prot opt source destination
162
163Chain FORWARD (policy ACCEPT)
164target prot opt source destination
165
166Chain OUTPUT (policy ACCEPT)
167target prot opt source destination
168
169# iptables -L -n -t nat
170Chain PREROUTING (policy ACCEPT)
171target prot opt source destination
172
173Chain POSTROUTING (policy ACCEPT)
174target prot opt source destination
175MASQUERADE all -- 10.1.1.0/24 !10.1.1.0/24
176MASQUERADE all -- !10.1.1.0/24 10.1.1.0/24
177
178Chain OUTPUT (policy ACCEPT)
179target prot opt source destination
180
181# ifconfig
182eth0 Link encap:Ethernet HWaddr 00:1e:67:15:2b:f1
183 inet addr:192.168.1.12 Bcast:192.168.1.255 Mask:255.255.255.0
184 inet6 addr: fe80::21e:67ff:fe15:2bf1/64 Scope:Link
185 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
186 RX packets:28785139 errors:0 dropped:0 overruns:0 frame:0
187 TX packets:19050735 errors:0 dropped:0 overruns:0 carrier:0
188 collisions:0 txqueuelen:1000
189 RX bytes:32068182803 (32.0 GB) TX bytes:6061333280 (6.0 GB)
190 Interrupt:16 Memory:b1a00000-b1a20000
191
192eth1 Link encap:Ethernet HWaddr 00:1e:67:15:2b:f0
193 inet addr:10.1.1.12 Bcast:10.1.1.255 Mask:255.255.255.0
194 inet6 addr: fe80::21e:67ff:fe15:2bf0/64 Scope:Link
195 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
196 RX packets:285086 errors:0 dropped:0 overruns:0 frame:0
197 TX packets:12719 errors:0 dropped:0 overruns:0 carrier:0
198 collisions:0 txqueuelen:1000
199 RX bytes:30817249 (30.8 MB) TX bytes:2153228 (2.1 MB)
200 Interrupt:16 Memory:b1900000-b1920000
201
202lo Link encap:Local Loopback
203 inet addr:127.0.0.1 Mask:255.0.0.0
204 inet6 addr: ::1/128 Scope:Host
205 UP LOOPBACK RUNNING MTU:16436 Metric:1
206 RX packets:86048 errors:0 dropped:0 overruns:0 frame:0
207 TX packets:86048 errors:0 dropped:0 overruns:0 carrier:0
208 collisions:0 txqueuelen:0
209 RX bytes:11426538 (11.4 MB) TX bytes:11426538 (11.4 MB)
210
211# route -n
212Kernel IP routing table
213Destination Gateway Genmask Flags Metric Ref Use Iface
2140.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
2150.0.0.0 10.1.1.1 0.0.0.0 UG 100 0 0 eth1
21610.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
21710.8.0.0 192.168.1.10 255.255.255.0 UG 0 0 0 eth0
218169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0
219192.168.1.0 0.0.0.0 255.255.255.0 U 1 0 0 eth0
220
221# arp -n
222# Note: Here I have changed all the different MACs except the ones corresponding to the Debian box (on 10.1.1.1 and 192.168.1.10)
223Address HWtype HWaddress Flags Mask Iface
224192.168.1.70 ether NN:NN:NN:NN:NN:NN C eth0
225192.168.1.90 ether NN:NN:NN:NN:NN:NN C eth0
226192.168.1.97 ether NN:NN:NN:NN:NN:NN C eth0
227192.168.1.103 ether NN:NN:NN:NN:NN:NN C eth0
228192.168.1.13 ether NN:NN:NN:NN:NN:NN C eth0
229192.168.1.120 (incomplete) eth0
230192.168.1.111 ether NN:NN:NN:NN:NN:NN C eth0
231192.168.1.118 ether NN:NN:NN:NN:NN:NN C eth0
232192.168.1.51 ether NN:NN:NN:NN:NN:NN C eth0
233192.168.1.102 (incomplete) eth0
234192.168.1.64 ether NN:NN:NN:NN:NN:NN C eth0
235192.168.1.52 ether NN:NN:NN:NN:NN:NN C eth0
236192.168.1.74 (incomplete) eth0
237192.168.1.94 ether NN:NN:NN:NN:NN:NN C eth0
238192.168.1.121 ether NN:NN:NN:NN:NN:NN C eth0
239192.168.1.72 ether NN:NN:NN:NN:NN:NN C eth0
240192.168.1.87 ether NN:NN:NN:NN:NN:NN C eth0
241192.168.1.91 ether NN:NN:NN:NN:NN:NN C eth0
242192.168.1.71 ether NN:NN:NN:NN:NN:NN C eth0
243192.168.1.78 ether NN:NN:NN:NN:NN:NN C eth0
244192.168.1.83 ether NN:NN:NN:NN:NN:NN C eth0
245192.168.1.88 (incomplete) eth0
246192.168.1.82 ether NN:NN:NN:NN:NN:NN C eth0
247192.168.1.98 ether NN:NN:NN:NN:NN:NN C eth0
248192.168.1.100 ether NN:NN:NN:NN:NN:NN C eth0
249192.168.1.93 ether NN:NN:NN:NN:NN:NN C eth0
250192.168.1.73 ether NN:NN:NN:NN:NN:NN C eth0
251192.168.1.11 ether NN:NN:NN:NN:NN:NN C eth0
252192.168.1.85 (incomplete) eth0
253192.168.1.112 ether NN:NN:NN:NN:NN:NN C eth0
254192.168.1.89 ether NN:NN:NN:NN:NN:NN C eth0
255192.168.1.65 ether NN:NN:NN:NN:NN:NN C eth0
256192.168.1.81 ether NN:NN:NN:NN:NN:NN C eth0
25710.1.1.1 ether 94:0c:6d:82:0d:98 C eth1
258192.168.1.53 ether NN:NN:NN:NN:NN:NN C eth0
259192.168.1.116 ether NN:NN:NN:NN:NN:NN C eth0
260192.168.1.61 ether NN:NN:NN:NN:NN:NN C eth0
261192.168.1.10 ether 6c:f0:49:a4:47:38 C eth0
262192.168.1.86 (incomplete) eth0
263192.168.1.119 ether NN:NN:NN:NN:NN:NN C eth0
264192.168.1.66 ether NN:NN:NN:NN:NN:NN C eth0
265192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth0
266192.168.1.1 ether NN:NN:NN:NN:NN:NN C eth1
267192.168.1.92 ether NN:NN:NN:NN:NN:NN C eth0
268
269# iptables -L -n
270Chain INPUT (policy ACCEPT)
271target prot opt source destination
272
273Chain FORWARD (policy ACCEPT)
274target prot opt source destination
275
276Chain OUTPUT (policy ACCEPT)
277target prot opt source destination
278
279# iptables -L -n -t nat
280Chain PREROUTING (policy ACCEPT)
281target prot opt source destination
282
283Chain INPUT (policy ACCEPT)
284target prot opt source destination
285
286Chain OUTPUT (policy ACCEPT)
287target prot opt source destination
288
289Chain POSTROUTING (policy ACCEPT)
290target prot opt source destination
291
292# tcpdump -i eth1 -qtln icmp
293tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
294listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
295IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 1, length 64
296IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 1, length 64
297IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 2, length 64
298IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 2, length 64
299IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 3, length 64
300IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 3, length 64
301IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 4, length 64
302IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 4, length 64
303IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 5, length 64
304IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 5, length 64
305IP 10.1.1.12 > X.X.X.X: ICMP echo request, id 21967, seq 6, length 64
306IP X.X.X.X > 10.1.1.12: ICMP echo reply, id 21967, seq 6, length 64
307^C
30812 packets captured
30912 packets received by filter
3100 packets dropped by kernel
311
312# route -n
313Kernel IP routing table
314Destination Gateway Genmask Flags Metric Ref Use Iface
3150.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 <---
3160.0.0.0 10.1.1.1 0.0.0.0 UG 100 0 0 eth1
317
318route del default gw 192.168.1.1 dev eth0