We need to use ifup/ifdown to bring up the interfaces, because ifconfig don't
know the ip of the interface after we modify cloud-early-config to avoid
first start up of public interface.
Reviewed-by: Edison
In order to make sure next time, booting process would use cloud-early-config's
setup, rather than networking scripts to bring up interfaces.
Reviewed-by: Kelven Yang
I can't see why we set eth0 to dhcp by default. It would result in eth0 want to
get a DHCP address from outside. We should always assign ip through
cloud-early-config for it.
But one point is, the priority of cloud-early-config and networking script is
the same. So even networking got some ip from outside, cloud-early-config
should able to override it(if cloud-early-config runs after networking) or
networking script won't get dhcp (if cloud-early-config runs before networking),
so I am not quite understand why router would get DHCP address in fact. Maybe
there are other issues.
The routing table with two nics may be messed up, due to we sent same
router(gateway) information from different DHCP server, in order to specify
default gateway. E.g.
Network A: 192.168.1.0/24, gw 192.168.1.1
Network B: 192.168.2.0/24, gw 192.168.2.1
User VM: Nic 1 connect to network A, get ip 192.168.1.10; nic 2 connect to
network B, get ip 192.168.2.10.
Set network A as the default network of user VM.
Currently we would send this information to user VM through DHCP offer:
In network A: dhcp-option:router 192.168.1.1
In network B: dhcp-option:router 192.168.1.1
So both NIC in the guest VM would receive 192.168.1.1 as router(gateway).
But, in CentOS 5.6, dhclient-scripts try to tell if the gateway is reachable
for current subnet.
So when we try to enable nic 2(eth1) of user VM, dhclient would receive:
IP: 192.168.2.10
Mask: 255.255.255.0
Router: 192.168.1.1
Then it would found that the specified gateway(router) is not within its own
subnet(192.168.2.0/24). But since we send out this ip(192.168.1.1) as the
gateway for it, dhclient thought that it should got someway to access the
network through this IP. So it would execute:
ip route add 192.168.1.1 dev eth1
ip route replace default via 192.168.1.1 dev eth1
But it can never reach 192.168.1.1(which is in the eth0's subnet and the
gateway of eth0) by go through eth1 interface. So it is messed up.
We've tested Windows 2008 R2, CentOS 5.3, CentOS 5.6 and Ubuntu 10.04. Windows
and Ubuntu are fine with above policy.
To solve this, we send different dhcp:router option according to the guest OS
type now.
We may need expand this list later, but for now we only know that CentOS and
RHEL would behavior in this way.
status 14042: resolved fixed
Summary of changes:
- Fix the order of source nat ip's : Static Nat IP's will be on top of Router source nat IP's. means Static NAT ip will take higher preference when compare to router ip while picking ip for source nat.
Reviewed-by: Abhi
Summary of changes: Added Hairpin Nat.
- defined Harpin NAT function.
- Called Hairpin NAT while adding/deleting port forwading and Static NAT rules.
- added rules in IPtables config file, this will be iniated during bootup to forward New/established connectons from eth0 to eth0.
Summary of Changes: Using multiple routing tables to send the packets on the public NIC's based on source IP for the following type of connections:
- Inbound connections of Static NAT ip .
- Outbound connections of static-NAT (using static NAT-ip for SNAT).
The problem is remove_first_ip() in ipassoc.sh can't be called more than one.
The call after the first time would result in iptable and ip command failure,
thus result in failure of execution of IpAssocCommand.
Use the same way to detect already disassociated ip address of non-first
IP(remove_an_ip()) to fix the issue.
reviewed-by: Edison Su
status 13606: resolved fixed
Revert "bug 11056: Add backported kernel and discard customized kernel module"
This reverts commit 857e817cfc707f4280f295a91642ded861c5aa68.
Bug 13403 is due to new kernel fail to suppose hot-unplug of xen vnif.
Notice the module is only backported for kernel 2.6.32-5-686-bigmem. That's why
I hardcode the kernel version here.
status 13403: resolved fixed
Summary of changes :
- Added a new flag -s to ipassoc command to carry if the ip address is
used for SNAT or not.
- SNAT is completly decoupled from the first flag. first flag is used
to decide if the ip address is first ip address of the interface.
- -s and -f are independent, SNAT can be enabled on the non-first ip
also.
Summary of changes:
- Mutiple routing table for each public interface is added (previously there is only one routing table ). when the packet is send out of public interface corresponding per-interface routing table will be used. per-interface routing table will modified when ever ip/interface added/deleted.
- New parameter is added to ipassoc command to include the default gateway for every interface/ip. prevously it is using only one public interface to send out, default gateway is obtained at the boot up time.
- In the DNAT case. In the revese path(from guest vm to outside, or when DNAT packet receives from the eth0) the public ip/source ip will not be available till POSTROUTING. to overcome this, DNAT connection are marked with routing table number at the time of connection creation, in the reverse path the routing table# from DNAT connection is used to detect per-interface routing table.
