Latest working kernel version: never worked Earliest failing kernel version: Distribution: ubuntu 7.10 Problem Description: I have a farm of web servers behind a load balancer in DSR mode. I would like to be able to dump packets with any IP address on the web servers through the load balancer and have web servers reply to these requests. Currently for every IP web servers are supposed to reply to, I have to configure the IP on all servers on their loopback interfaces. The web server listens on IN_ADDR_ANY and I am forcing packets into the INPUT chain via iptables/netfilter but the kernel never replies to any connection requests. I only see the counter for OutNoRoutes increasing. Steps to reproduce: web server: #iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 80 -j MARK --set-mark 1 #ip route add to local default dev lo protocol kernel table 1 #ip rule add fwmark 1 table 1 priority 1 client: #ip route add 1.1.1.1/32 via <web server IP> dev eth0 while making requests to 1.1.1.1:80 from the client you can see increasing OutNoRoutes counter but no connection ever takes place.
That doesn't work, you're routing the packet locally, but the destination address is non-local. Try REDIRECT or DNAT. This is not a bug, please close and turn to netfilter@vger.kernel.org.
Reply-To: akpm@linux-foundation.org > On Fri, 25 Jan 2008 03:59:27 -0800 (PST) bugme-daemon@bugzilla.kernel.org > wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=9812 > > Summary: Kernel does not deliver packets going through the INPUT > chain even if the app is listening on IN_ADDR_ANY > Product: Networking > Version: 2.5 > KernelVersion: 2.6.22-14 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Netfilter/Iptables > AssignedTo: networking_netfilter-iptables@kernel-bugs.osdl.org > ReportedBy: pawel@rogocz.com > > > Latest working kernel version: never worked > Earliest failing kernel version: > Distribution: ubuntu 7.10 > > Problem Description: > > I have a farm of web servers behind a load balancer in DSR mode. > I would like to be able to dump packets with any IP address on the web > servers > through the load balancer and have web servers reply to these requests. > Currently for every IP web servers are supposed to reply to, I have to > configure the IP on all servers on their loopback interfaces. The web server > listens on IN_ADDR_ANY and I am forcing packets into the INPUT chain via > iptables/netfilter but the kernel never replies to any connection requests. I > only see the counter for OutNoRoutes increasing. > > Steps to reproduce: > > web server: > > #iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 80 -j MARK > --set-mark > 1 > #ip route add to local default dev lo protocol kernel table 1 > #ip rule add fwmark 1 table 1 priority 1 > > client: > > #ip route add 1.1.1.1/32 via <web server IP> dev eth0 > > while making requests to 1.1.1.1:80 from the client you can see increasing > OutNoRoutes counter but no connection ever takes place. > >
Andrew Morton wrote: >> On Fri, 25 Jan 2008 03:59:27 -0800 (PST) bugme-daemon@bugzilla.kernel.org >> wrote: >> http://bugzilla.kernel.org/show_bug.cgi?id=9812 >> >> Problem Description: >> >> I have a farm of web servers behind a load balancer in DSR mode. >> I would like to be able to dump packets with any IP address on the web >> servers >> through the load balancer and have web servers reply to these requests. >> Currently for every IP web servers are supposed to reply to, I have to >> configure the IP on all servers on their loopback interfaces. The web server >> listens on IN_ADDR_ANY and I am forcing packets into the INPUT chain via >> iptables/netfilter but the kernel never replies to any connection requests. >> I >> only see the counter for OutNoRoutes increasing. >> >> Steps to reproduce: >> >> web server: >> >> #iptables -A PREROUTING -i eth0 -t mangle -p tcp --dport 80 -j MARK >> --set-mark >> 1 >> #ip route add to local default dev lo protocol kernel table 1 >> #ip rule add fwmark 1 table 1 priority 1 >> >> client: >> >> #ip route add 1.1.1.1/32 via <web server IP> dev eth0 >> >> while making requests to 1.1.1.1:80 from the client you can see increasing >> OutNoRoutes counter but no connection ever takes place. I already commented in bugzilla, this is not a bug but an incorrect setup. DNAT or REDIRECT must be used to make this work properly.
Closing the bug as noted. (Partick, I am not sure what you meant in #1. I can't reassign it to netfilter@vger.kernel.org, this account doesn't exist in bugzilla. Does it need to be created?)
No, that is the netfilter user mailing list :) I meant to say that this is a misunderstanding of how this works and the userlist is an appropriate forum to ask for help.
Ok, that was first thing that I thought... :)