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Special Forums IP Networking sharing of IP address for load sharing avoiding virtual server & redirection machine Post 81956 by Rakesh Ranjan on Thursday 25th of August 2005 01:45:58 PM
Old 08-25-2005
What socket (IP addr+port) and how to filter

Thanks Sergiu but can u tell me how can I read the request made , I mean do I need to make each process on each server register itself using setsockopt and at what IP address (the local IP address or the broadcast IP address) and port should I be listening to
Also afterwards I need to filter the request according to my algorithm (depending upon the load each server is having at that time) and this code is complex enough to make it unfit to be implemented using IPTables so where in the Kernel code is filtering done that I can modify to achieve the same..

I would be thankful for a timely reply.
 

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bootpquery(1M)															    bootpquery(1M)

NAME
bootpquery - send BOOTREQUEST to BOOTP server SYNOPSIS
haddr [htype] [options] DESCRIPTION
is a diagnostic function used to check the configuration of the Internet Bootstrap Protocol (BOOTP) server, bootpd(1M). This function can only be run by the superuser, since it uses reserved ports. constructs a boot request with the supplied parameters to send to the BOOTP server, and prints the contents of the BOOTP server reply (as shown in below). Note that formats and prints RFC-1048 or CMU-style vendor information included in the BOOTREPLY. The BOOTREQUEST packet is broadcast on the BOOTP server port, If a BOOTP server is configured to respond to the request, it returns a BOOTREPLY packet on the BOOTP client port, can only display BOOTREPLY packets when the BOOTP server broadcasts the reply on the client port or when the hardware address and IP address supplied in the BOOTREQUEST are those of the host on which is run. The following options provide the information for the BOOTREQUEST: Hardware address of the BOOTP client; used in the BOOTREQUEST. A BOOTP server responds if it has configuration information for a host with this link-level address. Type of address specified as haddr; may be or The default address type is Specify the internet address of the BOOTP client to be used in the BOOTREQUEST. If the BOOTP client does not know its IP address, the BOOTP server supplies it in the BOOTREPLY. Otherwise, the server returns the BOOTREPLY directly to ipaddr. Specify the name of the BOOTP server to receive BOOTREQUEST. When the BOOTP server is known, the BOOTREQUEST is not broadcast. Specify a vendor name to include vendor information in the BOOTREPLAY. vendor can be specified as or For any other vendor specification, the first four characters of the parameter are used as the vendor magic cookie. Specify that should broadcast the reply back. This option is only valid for on the HPUX 10.0 (or later) release(s). Specify a boot file needed by the BOOTP client. If a boot file is specified in the BOOTREQUEST, the BOOTP server responds only if the server host can make the file available. EXAMPLES
/usr/sbin/bootpquery 02608cee018e ether -s hpserver Received BOOTREPLY from hpserver.hp.com (15.9.18.119) Hardware Address: 02:60:8c:ee:01:8e Hardware Type: ethernet IP Address: 15.9.18.113 Boot file: /export/tftpdir/hp-gw2-confg RFC 1048 Vendor Information: Subnet Mask: 255.255.248.0 Bootfile Size: 6 512 byte blocks Domain Name Server: 15.9.18.119 Host Name: hp-gw2 AUTHOR
was developed by HP. SEE ALSO
bootpd(1M), tftp(1), tftpd(1M). DARPA Internet Request For Comments RFC951, RFC1048, RFC1084, RFC1395, RFC1542 Assigned Numbers. bootpquery(1M)
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