Harihara Vinayakaram's questions

I am developing a small test client for websockets. I am using Ubuntu 11.04 . I have read https://stackoverflow.com/questions/410616/increasing-the-maximum-number-of-tcp-ip-connections-in-linux and I have done the following

sudo sysctl -w  net.ipv4.tcp_fin_timeout=10 
sysctl -w net.ipv4.ip_local_port_range="1024 65535" 

As I understand these are for inbound connections and not outbound.

When I type

ulimit -n
unlimited

My client and servers run on different boxes. Even with all the above I am not able to cross beyound 1000 connections from a box . If there is a different tip let me know

ANSWER I figured this by typing ulimit -a which shows all the kernel limits .

ulimit -n 
unlimited 

while

ulimit -a 

returns the value for nofile as 1024. I set the limits in the /etc/security/limits.conffile in the format

 <user> soft nofile 8192 
 <user> hard nofile 65000 

and things worked for user

I have a ISC DHCP Server installed on Ubuntu 9.10 . I have managed to successfully boot a PXE client , obtain a DHCP address and load the initrd.gz file. But I am facing a vague problem when the debian installer starts up and tries to get a DHCP server

The client send a DHCP request and I verified that is the same MAC Address. But I get a DHCP DECLINE (The client declines the address ). It offers all the address in the pool and then there is a DHCP NAK (no more free leases )

I tried using the Option no-ping, and also option one-client-one-lease but it does not help .

If I set the client to use a fixed-address then the above problem is not there and the installation proceeds smoothly

Can you give me any clues on what should be the DHCP server configuration

My dhcpd.conf looks like this

{
    ddns-update-style none;
    option domain-name "hadoop-myorg.org";
    option domain-name-servers 192.168.3.5;
    default-lease-time 600;
    max-lease-time 7200;

    group {
        filename "pxelinux.0";
        next-server 192.168.13.184;
        host hadoop1 { hardware ethernet 90:e6:ba:d5:53:f8; }
    }

    subnet 192.168.13.0 netmask 255.255.255.0 {
        option routers 10.0.0.254;

        pool {
            option domain-name-servers 192.168.3.5;
            max-lease-time 3000;
            range 192.168.13.55 192.168.13.65;
            deny unknown-clients;
        }
    }
}