Hi,
I'm trying to configure a virtual Ubuntu Server as a router. I think I got all the settings right, but if that were true I wouldn't be posting here..
First, let me explain what I'm trying to do:
I have a Windows PC (a real one, not virtual), it has 1 network interface, IP = 192.168.1.31
I have a virtual Ubuntu Server with 4 interfaces:
eth0: 192.168.1.139
eth1: 192.168.11.139
eth2: 192.168.12.139
eth3: 192.168.13.139
And a virtual CentOS with 4 interfaces:
eth0: 192.168.1.136 (this one is disabled during testing)
eth1: 192.168.11.136
eth2: 192.168.12.136
eth3: 192.168.13.136
Here's a diagram:
Both eth0 are connected to my switch and everything on 192.168.1.0/24 is working without problems.Code:192.168.1.1/24 +------------+-------------------------------+ | | | | | X | | 192.168.11.0/24 | | ---------------------- | 31 139 / 192.168.12.0/24 \ 136 Windows Ubuntu ------------------------ Centos \ 192.168.13.0/24 / ----------------------
The other interfaces are connected through an internal VMware connection.
Windows can ping Ubuntu, Ubuntu can ping Windows.
Ubuntu can ping all 3 interfaces of Centos and the other way around.
Windows can ping 1 interface from Centos, but not the other 2. Centos cannot ping Windows at all. Traceroute shows that they get to the Ubuntu but not further.
And yes, IP forwarding is on.
Output from Ubuntu:
Output from Windows:Code:user@UbuntuServer:~$ sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 1 user@UbuntuServer:~$ ifconfig eth0 Link encap:Ethernet HWaddr 00:50:56:13:90:00 inet addr:192.168.1.139 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:9000/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:9546 errors:0 dropped:0 overruns:0 frame:0 TX packets:572 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:868318 (868.3 KB) TX bytes:78458 (78.4 KB) eth1 Link encap:Ethernet HWaddr 00:50:56:13:90:01 inet addr:192.168.11.139 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:9001/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:182 errors:0 dropped:0 overruns:0 frame:0 TX packets:95 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:27938 (27.9 KB) TX bytes:14743 (14.7 KB) eth2 Link encap:Ethernet HWaddr 00:50:56:13:90:02 inet addr:192.168.12.139 Bcast:192.168.12.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:9002/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:150 errors:0 dropped:0 overruns:0 frame:0 TX packets:108 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:25330 (25.3 KB) TX bytes:16229 (16.2 KB) eth3 Link encap:Ethernet HWaddr 00:50:56:13:90:03 inet addr:192.168.13.139 Bcast:192.168.13.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:9003/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:147 errors:0 dropped:0 overruns:0 frame:0 TX packets:71 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:25150 (25.1 KB) TX bytes:12533 (12.5 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:100 errors:0 dropped:0 overruns:0 frame:0 TX packets:100 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6996 (6.9 KB) TX bytes:6996 (6.9 KB) user@UbuntuServer:~$ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 192.168.13.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 user@UbuntuServer:~$ ping 192.168.1.31 -c 1 PING 192.168.1.31 (192.168.1.31) 56(84) bytes of data. 64 bytes from 192.168.1.31: icmp_req=1 ttl=128 time=0.404 ms user@UbuntuServer:~$ ping 192.168.11.136 -c 1 PING 192.168.11.136 (192.168.11.136) 56(84) bytes of data. 64 bytes from 192.168.11.136: icmp_req=1 ttl=64 time=0.648 ms user@UbuntuServer:~$ ping 192.168.12.136 -c 1 PING 192.168.12.136 (192.168.12.136) 56(84) bytes of data. 64 bytes from 192.168.12.136: icmp_req=1 ttl=64 time=5.69 ms
Note that I can reach all interfaces from the Ubuntu server, even the ones on a different subnet.
Output from CentosCode:IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.1 192.168.1.31 10 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.1.0 255.255.255.0 On-link 192.168.1.31 266 192.168.1.31 255.255.255.255 On-link 192.168.1.31 266 192.168.1.255 255.255.255.255 On-link 192.168.1.31 266 192.168.10.0 255.255.255.0 192.168.1.139 192.168.1.31 11 192.168.11.0 255.255.255.0 192.168.1.139 192.168.1.31 11 192.168.12.0 255.255.255.0 192.168.1.139 192.168.1.31 11 192.168.13.0 255.255.255.0 192.168.1.139 192.168.1.31 11 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.1.31 266 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.1.31 266 Pinging 192.168.1.139 with 32 bytes of data: Reply from 192.168.1.139: bytes=32 time<1ms TTL=64 Pinging 192.168.11.139 with 32 bytes of data: Reply from 192.168.11.139: bytes=32 time<1ms TTL=64 Pinging 192.168.12.139 with 32 bytes of data: Reply from 192.168.12.139: bytes=32 time<1ms TTL=64 Pinging 192.168.11.136 with 32 bytes of data: Reply from 192.168.11.136: bytes=32 time=7ms TTL=63 Pinging 192.168.12.136 with 32 bytes of data: Request timed out. Pinging 192.168.13.136 with 32 bytes of data: Request timed out. Tracing route to 192.168.12.136 over a maximum of 30 hops 1 <1 ms <1 ms <1 ms UBUNTUSERVER [192.168.1.139] 2 * * * Request timed out. 3 * * * Request timed out.
Note that eth0 is down
Sorry for the wall of code, but this has been driving me crazy for some time now. Any help in troubleshooting this would be greatly appreciated.Code:[root@CentOS ~]# sysctl net.ipv4.ip_forward net.ipv4.ip_forward = 0 [root@CentOS ~]# ifconfig -a eth0 Link encap:Ethernet HWaddr 00:50:56:13:60:00 BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:743 errors:0 dropped:0 overruns:0 frame:0 TX packets:40 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:70085 (68.4 KiB) TX bytes:7490 (7.3 KiB) eth1 Link encap:Ethernet HWaddr 00:50:56:13:60:01 inet addr:192.168.11.136 Bcast:192.168.11.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:6001/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:170 errors:0 dropped:0 overruns:0 frame:0 TX packets:66 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:33144 (32.3 KiB) TX bytes:7017 (6.8 KiB) eth2 Link encap:Ethernet HWaddr 00:50:56:13:60:02 inet addr:192.168.12.136 Bcast:192.168.12.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:6002/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:166 errors:0 dropped:0 overruns:0 frame:0 TX packets:33 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:32419 (31.6 KiB) TX bytes:4423 (4.3 KiB) eth3 Link encap:Ethernet HWaddr 00:50:56:13:60:03 inet addr:192.168.13.136 Bcast:192.168.13.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:fe13:6003/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:123 errors:0 dropped:0 overruns:0 frame:0 TX packets:32 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:29284 (28.5 KiB) TX bytes:4453 (4.3 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 b) TX bytes:0 (0.0 b) [root@CentOS ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.13.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 0 eth2 169.254.0.0 0.0.0.0 255.255.0.0 U 1005 0 0 eth3 0.0.0.0 192.168.11.139 0.0.0.0 UG 0 0 0 eth1 [root@CentOS ~]# traceroute 192.168.1.31 -m 5 traceroute to 192.168.1.31 (192.168.1.31), 5 hops max, 60 byte packets 1 192.168.11.139 (192.168.11.139) 0.578 ms 0.541 ms 0.598 ms 2 * * * 3 * * *
Adv Reply
Bookmarks