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Posted to commits@cloudstack.apache.org by re...@apache.org on 2015/12/11 19:42:55 UTC
[2/2] git commit: updated refs/heads/master to c9985e9
Merge pull request #1214 from remibergsma/rfc1918_route
CLOUDSTACK-9143 Setup routes for RFC 1918 ip spaceSetup general route for RFC 1918 space, as otherwise it will be sent to the public gateway and likely to be dropped (internet providers do not route ip space that is meant for internal use). More specific routes that may be set have preference over this generic routes so this works even with private ranges used for public ip space (as shown below).
When using an internal DNS server some hosts may resolve to an RFC 1918 ip address. The SSVM has a default gw to public so if it has no route for this ip address space, it will not work. This PR makes generic RFC 1918 (so all internal ip adresses like 10.0.0.10 etc) to the local management gateway. This makes them reachable. Without this fix, it is sent upstream and it is dropped there.
Should there be a more generic route (smaller prefix), this has preference over the generic routes.
Example in my dev environment:
```
root@v-1-VM:~# route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.23.1 0.0.0.0 UG 0 0 0 eth2
10.0.0.0 192.168.22.1 255.0.0.0 UG 0 0 0 eth1
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
172.16.0.0 192.168.22.1 255.240.0.0 UG 0 0 0 eth1
192.168.0.0 192.168.22.1 255.255.0.0 UG 0 0 0 eth1
192.168.22.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
192.168.23.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
```
Route `192.168.0.0/16` goes via `eth1` but `192.168.23.0/24` is more specific and has preference and goes via `eth2`. It works:
```
root@v-1-VM:~# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 48 data bytes
56 bytes from 8.8.8.8: icmp_seq=0 ttl=49 time=7.179 ms
^C--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 7.179/7.179/7.179/0.000 ms
```
This solves a lot of the 'internal resolving' issues we face.
When the public ip address is RFC1918 itself, we do not set the routes.
* pr/1214:
Setup routes for RFC 1918 ip space
Signed-off-by: Remi Bergsma <gi...@remi.nl>
Project: http://git-wip-us.apache.org/repos/asf/cloudstack/repo
Commit: http://git-wip-us.apache.org/repos/asf/cloudstack/commit/c9985e96
Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/c9985e96
Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/c9985e96
Branch: refs/heads/master
Commit: c9985e96a5446395f402faccd422935d24b7c933
Parents: 1ed5c20 67b4a7b
Author: Remi Bergsma <gi...@remi.nl>
Authored: Fri Dec 11 19:42:36 2015 +0100
Committer: Remi Bergsma <gi...@remi.nl>
Committed: Fri Dec 11 19:42:36 2015 +0100
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.../debian/config/etc/init.d/cloud-early-config | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
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