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I have a couple of Linux guest VMs with bridged network to my physical adapter. For a certain reason I can't use the subnet of my host machine for the guests (and virtual adapter is too slow for me), so I created a separate subnet for them.
On host I added the guest subnet:
C:\> route add 192.168.20.0 mask 255.255.255.0 0.0.0.0 metric 1
On guests:
# route add -host 192.168.148.87 dev eth3 # my host ip
It mostly works:
basin@BASIN /cygdrive/c/Users/basin
$ tracert -d 192.168.20.20
Tracing route to 192.168.20.20 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.20.20
Trace complete.
basin@BASIN /cygdrive/c/Users/basin
$ tracert -d 192.168.20.21
Tracing route to 192.168.20.21 over a maximum of 30 hops
1 <1 ms <1 ms <1 ms 192.168.20.21
Trace complete.
But it looks like some packets go through the gateway:
basin@BASIN /cygdrive/c/Users/basin
$ tracert -d 192.168.20.23
Tracing route to 192.168.20.23 over a maximum of 30 hops
2 <1 ms <1 ms <1 ms 192.168.200.1 0
3 192.168.200.1 reports: Destination host unreachable.
Trace complete.
SSH connections to the guests often stall. What am I doing wrong?
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination Netmask Gateway Interface Metric
0.0.0.0 0.0.0.0 192.168.149.200 192.168.148.87 20
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
192.168.20.0 255.255.255.0 On-link 192.168.148.87 21
192.168.20.255 255.255.255.255 On-link 192.168.148.87 276
192.168.56.0 255.255.255.0 On-link 192.168.56.1 266
192.168.56.1 255.255.255.255 On-link 192.168.56.1 266
192.168.56.255 255.255.255.255 On-link 192.168.56.1 266
192.168.148.0 255.255.254.0 On-link 192.168.148.87 276
192.168.148.87 255.255.255.255 On-link 192.168.148.87 276
192.168.149.255 255.255.255.255 On-link 192.168.148.87 276
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 192.168.148.87 276
224.0.0.0 240.0.0.0 On-link 192.168.56.1 266
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 192.168.148.87 276
255.255.255.255 255.255.255.255 On-link 192.168.56.1 266
===========================================================================
Upd:
Could it be that OS sends some ICMP request to different places and the reply overrides my static route? How to check this?
what virtualization solution are you using? I used VirtualBox on Windows (now I am on OS X and still using VirtualBox) and it has a nice Networking part which does not need additional setup on host/guest as you described. – Zina – 2016-06-21T22:26:49.130
@Zina I use VirtualBox. I explained my case in the 1st paragraph. Bridge gives me 2.5Gbit. Other modes - 100Mbit – basin – 2016-06-22T06:37:52.010
strange you cant get more than 100Mbit with other connections. What type of adapter did you select? A 1Gb or the PCnet? And I don't see where from the hop to 192.168.200.1 came? I do not see it in your routing table. – Zina – 2016-06-22T22:45:34.373