souyofnewerth opened a new issue, #14464:
URL: https://github.com/apache/cloudstack/issues/14464
### problem
Isolated network router, source NAT on eth2 (192.0.2.43), static NAT IP
203.0.113.114 on eth3
(second VLAN) to VM 10.168.10.37. After Disable/Enable Static NAT the mangle
chain was:
-A PREROUTING -s 10.168.10.37/32 -m state --state NEW -j
PREROUTING-eth3-def
-A PREROUTING-eth3-def -j CONNMARK --save-mark --nfmask 0xffffffff
--ctmask 0xffffffff
-A PREROUTING-eth3-def -j MARK --set-xmark 0x67/0xffffffff
CONNMARK --save-mark runs before MARK, so the connection is stored with
mark=0. The first packet
(SYN) is routed by fwmark 0x67 to Table_eth3 and SNATed to 203.0.113.114,
but later packets of the
connection get mark 0 from --restore-mark, follow the main table out eth2
with source
203.0.113.114 and are dropped upstream. "curl -4 ifconfig.me" in the VM
hangs; conntrack shows
ESTABLISHED/UNREPLIED entries with mark=0. On an earlier router build the
order was MARK then
CONNMARK --save-mark and it worked.
### versions
CloudStack 4.23.0.0, KVM, systemvm template 4.22.0 (router reports version
4.22.0), isolated network.
### The steps to reproduce the bug
1. Isolated network with source NAT on the untagged range; acquire a public
IP from a second VLAN.
2. Enable Static NAT to a VM, then Disable and Enable it again.
3. In the router: iptables -t mangle -S PREROUTING-ethX-def -> CONNMARK
--save-mark comes first.
4. In the VM: curl -4 ifconfig.me hangs; conntrack -L -s <vm ip> shows
mark=0.
### What to do about it?
Generate the chain with MARK before CONNMARK --save-mark (append in that
order, or insert both
at fixed positions). Workaround: iptables -t mangle -I PREROUTING-ethX-def 1
-j MARK --set-xmark 0x6N
and conntrack -D -s <vm ip>.
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