Ok guys, here is what I've done now trying to setup LVS-NAT:
LVS server:
root@lvs1:~# ifconfig
eth0 Link encap:Ethernet HWaddr 76:bc:30:e1:95:29
inet addr:10.56.213.7 Bcast:10.56.213.103 Mask:255.255.255.192
inet6 addr: fe80::74bc:30ff:fee1:9529/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:40395 errors:0 dropped:0 overruns:0 frame:0
TX packets:115566 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11154768 (11.1 MB) TX bytes:10420406 (10.4 MB)
eth0:2 Link encap:Ethernet HWaddr 76:bc:30:e1:95:29
inet addr:192.168.12.2 Bcast:192.168.12.7 Mask:255.255.255.248
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth0:3 Link encap:Ethernet HWaddr 76:bc:30:e1:95:29
inet addr:192.168.12.1 Bcast:192.168.12.7 Mask:255.255.255.248
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
eth1 Link encap:Ethernet HWaddr 1a:99:f3:ea:7c:e6
inet addr:192.168.0.1 Bcast:192.168.0.3 Mask:255.255.255.252
inet6 addr: fe80::1899:f3ff:feea:7ce6/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:89880 errors:0 dropped:0 overruns:0 frame:0
TX packets:113137 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:6277612 (6.2 MB) TX bytes:15654801 (15.6 MB)
eth1:1 Link encap:Ethernet HWaddr 1a:99:f3:ea:7c:e6
inet addr: **publicIP** Bcast:**broadcast** Mask:255.255.255.248
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
root@lvs1:~# sysctl -p
net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.accept_source_route = 0
root@lvs1:~# ipvsadm
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP **mypublicDomain**:http rr
-> 192.168.12.4:http Masq 1 0 3
root@lvs1:~# lynx --dump 192.168.12.4
It works!
This is the default web page for this server.
The web server software is running but no content has been added, yet.
One realserver (192.168.12.4):
root@ns1:~# ifconfig
eth0 Link encap:Ethernet HWaddr be:b2:76:d3:4f:ff
inet addr:192.168.12.4 Bcast:192.168.12.7 Mask:255.255.255.248
inet6 addr: fe80::bcb2:76ff:fed3:4fff/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:6757 errors:0 dropped:0 overruns:0 frame:0
TX packets:8980 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:358707 (358.7 KB) TX bytes:2761791 (2.7 MB)
/etc/network/interfaces
auto eth0
iface eth0 inet static
address 192.168.12.4
netmask 255.255.255.248
broadcast 192.168.12.7
gateway 192.168.12.1
root@ns1:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use
Iface
192.168.12.0 0.0.0.0 255.255.255.248 U 0 0 0 eth0
Now testing it trying to access **mypublicIP**:80
ETH1 (PUBLIC IP TCPDUMP)
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
10:50:46.630822 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292573515 ecr 0,sackOK,eol], length 0
10:50:46.641358 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292573515 ecr 0,sackOK,eol], length 0
10:50:46.890409 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292573760 ecr 0,sackOK,eol], length 0
10:50:47.736744 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292574604 ecr 0,sackOK,eol], length 0
10:50:47.744056 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292574604 ecr 0,sackOK,eol], length 0
10:50:47.946942 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292574802 ecr 0,sackOK,eol], length 0
10:50:48.840885 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292575697 ecr 0,sackOK,eol], length 0
10:50:48.848524 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292575697 ecr 0,sackOK,eol], length 0
10:50:49.050437 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292575893 ecr 0,sackOK,eol], length 0
10:50:49.944101 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292576786 ecr 0,sackOK,eol], length 0
10:50:49.951483 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292576786 ecr 0,sackOK,eol], length 0
10:50:50.153465 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292576984 ecr 0,sackOK,eol], length 0
10:50:51.048314 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292577876 ecr 0,sackOK,eol], length 0
10:50:51.055642 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292577876 ecr 0,sackOK,eol], length 0
10:50:51.258095 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292578074 ecr 0,sackOK,eol], length 0
10:50:52.153507 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292578964 ecr 0,sackOK,eol], length 0
10:50:52.160489 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292578964 ecr 0,sackOK,eol], length 0
10:50:52.367694 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292579162 ecr 0,sackOK,eol], length 0
10:50:54.261032 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292581049 ecr 0,sackOK,eol], length 0
10:50:54.268266 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292581049 ecr 0,sackOK,eol], length 0
10:50:54.470990 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292581246 ecr 0,sackOK,eol], length 0
10:50:58.360312 IP 177.54.114.32.52692 > **MYPUBLICIP**.80: Flags [S], seq
2306349141, win 65535, options [mss 1440,sackOK,eol], length 0
10:50:58.367643 IP 177.54.114.32.52691 > **MYPUBLICIP**.80: Flags [S], seq
2697243517, win 65535, options [mss 1440,sackOK,eol], length 0
10:50:58.570472 IP 177.54.114.32.52693 > **MYPUBLICIP**.80: Flags [S], seq
3700386367, win 65535, options [mss 1440,sackOK,eol], length 0
Then It seems ipvsadm redirects packet from eth1 to eth0 correctly and
rewrites the packet to match the new destination IP (my realserver):
root@lvs1:~# tcpdump -ni eth0:3 not host 224.0.0.18
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0:3, link-type EN10MB (Ethernet), capture size 65535 bytes
10:48:20.506530 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292429109 ecr 0,sackOK,eol], length 0
10:48:20.506569 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292429109 ecr 0,sackOK,eol], length 0
10:48:20.759464 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292429356 ecr 0,sackOK,eol], length 0
10:48:21.518465 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292430109 ecr 0,sackOK,eol], length 0
10:48:21.518857 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292430109 ecr 0,sackOK,eol], length 0
10:48:21.823556 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292430406 ecr 0,sackOK,eol], length 0
10:48:22.621495 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292431203 ecr 0,sackOK,eol], length 0
10:48:22.622106 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292431203 ecr 0,sackOK,eol], length 0
10:48:22.925555 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292431500 ecr 0,sackOK,eol], length 0
10:48:23.726898 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292432295 ecr 0,sackOK,eol], length 0
10:48:23.727515 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292432295 ecr 0,sackOK,eol], length 0
10:48:24.030893 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292432592 ecr 0,sackOK,eol], length 0
10:48:24.831695 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292433387 ecr 0,sackOK,eol], length 0
10:48:24.831850 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292433387 ecr 0,sackOK,eol], length 0
10:48:25.132910 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292433685 ecr 0,sackOK,eol], length 0
10:48:25.509307 ARP, Request who-has 192.168.12.4 tell 192.168.12.2, length
28
10:48:25.510077 ARP, Reply 192.168.12.4 is-at be:b2:76:d3:4f:ff, length 28
10:48:25.934629 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292434474 ecr 0,sackOK,eol], length 0
10:48:25.934664 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292434474 ecr 0,sackOK,eol], length 0
10:48:26.235733 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292434773 ecr 0,sackOK,eol], length 0
10:48:28.040339 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292436562 ecr 0,sackOK,eol], length 0
10:48:28.040803 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292436562 ecr 0,sackOK,eol], length 0
10:48:28.341964 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292436858 ecr 0,sackOK,eol], length 0
10:48:32.177348 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,sackOK,eol], length 0
10:48:32.177658 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,sackOK,eol], length 0
10:48:32.479714 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,sackOK,eol], length 0
10:48:40.464706 IP 177.54.114.32.52681 > 192.168.12.4.80: Flags [S], seq
1943196812, win 65535, options [mss 1440,sackOK,eol], length 0
10:48:40.464740 IP 177.54.114.32.52680 > 192.168.12.4.80: Flags [S], seq
2842631520, win 65535, options [mss 1440,sackOK,eol], length 0
10:48:40.566405 IP 177.54.114.32.52682 > 192.168.12.4.80: Flags [S], seq
267664571, win 65535, options [mss 1440,sackOK,eol], length 0
Then I have at the realserver (192.168.12.4):
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
10:53:31.819480 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292739115 ecr 0,sackOK,eol], length 0
10:53:31.820101 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292739115 ecr 0,sackOK,eol], length 0
10:53:32.072647 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292739362 ecr 0,sackOK,eol], length 0
10:53:32.868727 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292740150 ecr 0,sackOK,eol], length 0
10:53:32.868748 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292740150 ecr 0,sackOK,eol], length 0
10:53:33.171616 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292740447 ecr 0,sackOK,eol], length 0
10:53:33.971436 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292741243 ecr 0,sackOK,eol], length 0
10:53:33.971570 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292741243 ecr 0,sackOK,eol], length 0
10:53:34.274381 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292741542 ecr 0,sackOK,eol], length 0
10:53:35.076124 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292742336 ecr 0,sackOK,eol], length 0
10:53:35.076265 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292742336 ecr 0,sackOK,eol], length 0
10:53:35.378447 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292742630 ecr 0,sackOK,eol], length 0
10:53:36.179796 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292743422 ecr 0,sackOK,eol], length 0
10:53:36.179936 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292743422 ecr 0,sackOK,eol], length 0
10:53:36.482287 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292743719 ecr 0,sackOK,eol], length 0
10:53:36.834363 ARP, Request who-has 192.168.12.4 tell 192.168.12.2, length
28
10:53:36.834383 ARP, Reply 192.168.12.4 is-at be:b2:76:d3:4f:ff, length 28
10:53:37.276263 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292744514 ecr 0,sackOK,eol], length 0
10:53:37.284936 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292744514 ecr 0,sackOK,eol], length 0
10:53:37.587990 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292744810 ecr 0,sackOK,eol], length 0
10:53:39.385848 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292746596 ecr 0,sackOK,eol], length 0
10:53:39.394545 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292746596 ecr 0,sackOK,eol], length 0
10:53:39.697490 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,nop,wscale 4,nop,nop,TS val
292746893 ecr 0,sackOK,eol], length 0
10:53:43.920488 IP 177.54.114.32.52711 > 192.168.12.4.80: Flags [S], seq
329952672, win 65535, options [mss 1440,sackOK,eol], length 0
10:53:43.928976 IP 177.54.114.32.52712 > 192.168.12.4.80: Flags [S], seq
2821848538, win 65535, options [mss 1440,sackOK,eol], length 0
10:53:43.930672 IP 177.54.114.32.52713 > 192.168.12.4.80: Flags [S], seq
3482892199, win 65535, options [mss 1440,sackOK,eol], length 0
And thats it, I can't see any response back from realserver to gateway and
those syn packets are all I can see from/to those ips related to LVS.
PS: I try to setup some MASQUERADE iptables nat rule, but it didn't change
nothing.
What am I missing?
2014-03-25 8:41 GMT-03:00 Tiago <syt...@gmail.com>:
> Yes, I've said about RPF, but I think I should see the packets "trying" to
> go out I guess.
>
> I'll give a try using NAT, because at my first try it didn't work either.
> I get back to you this morning yet.
>
> Just a note, I'm using ubuntu 12.04-4 server. Is any problem related to it?
>
>
> 2014-03-25 4:42 GMT-03:00 Ferenc Wagner <wf...@niif.hu>:
>
> Malcolm Turnbull <malc...@loadbalancer.org> writes:
>>
>> > But rp_filter just controls where the reply packet goes
>>
>> As far as I know, rp_filter is on the input side: it drops a packet if
>> the hypothetical reply packet *would* go out on a different interface to
>> the one the packet arrived on. Thus it must be switched off in
>> asymmetric routing scenarios.
>> --
>> Regards,
>> Feri.
>>
>> _______________________________________________
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>> http://www.linuxvirtualserver.org/
>>
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>
>
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