02-25-2003
Your safest bet would probably be to ask the Network Admin to block incoming to your boxes at the border router / firewall. I don't know if you want to block incoming and outgoing, but either way should be a relatively simple excercise for him (or her).
You may want to do that post-haste if you have not properly secured your boxes (and X isn't too terribly secure to have open, let alone floating around...).
9 More Discussions You Might Find Interesting
1. HP-UX
Anybody know how to set up xdmcp on HPUX (11.0 +)?
Thanks. (1 Reply)
Discussion started by: lyonsd
1 Replies
2. Solaris
Hi, Boss
i have a problem about open the Graphic remote. when i used the Xmanager2.0 connect to the Sun Fire880 with Sun solaris 2.8 software. prompt to following information:
XDMCP connection failed: retry?
so can some body told me how the check the XDMCP protocol was enable...and the port 177... (9 Replies)
Discussion started by: surainbow
9 Replies
3. UNIX for Advanced & Expert Users
I'd like to get some opnions on choosing DNS server:
Windows DNS vs Linux BIND comparrsion:
1) managment, easy of use
2) Security
3) features
4) peformance
5) ??
I personally prefer Windows DNS server for management, it supports GUI and command line. But I am not sure about security... (2 Replies)
Discussion started by: honglus
2 Replies
4. IP Networking
I'm no DNS expert, and I'm hoping someone would be able to help me with this issue I'm facing.
I have a set of links in the following schema:
http://somedomain.com/xyz
http://somedomain.com/abc
http://somedomain.com/123
and they are pointing to content at:
... (1 Reply)
Discussion started by: DeepakS
1 Replies
5. AIX
Hi,
We have a user who cannot connect to the aix system anymore with hummingbird exceed.
Our unix servers are aix 5.3. She is running windows xp and using hummingbird 12.
She used to not have any problem, but now when she tries to use xstart she gets an error 'unable to connect to host using... (0 Replies)
Discussion started by: fwellers
0 Replies
6. Solaris
Hi All,
I'm new for Solaris and exceed both. I tried searching in forum but couldn't locate any similar issue posted so posting the issue. I'm remotely connecting a solaris machine using Exceed XDMCP Query and while login I select Chinese language / locale for login. After login when I... (0 Replies)
Discussion started by: kshukla08
0 Replies
7. Red Hat
I am trying to setup a CentOS 6.2 server that will be doing 3 things DHCP, DNS & Samba for a very small office (2 users). The idea being this will replace a very old Win2k server. The users are all windows based clients so only the server will be Linux based.
I've installed CentOS 6.2 with... (4 Replies)
Discussion started by: FireBIade
4 Replies
8. Red Hat
Hi,
I have recently built a new DNS server and created a new zone.
I use an ESMTP server to handle mail and the new domain has been added to this.
I can send mail to gmail and other domain addresses but unable to send it to one particular domain. (DSN:Service Unavailable)
DNS... (2 Replies)
Discussion started by: Duffs22
2 Replies
9. Solaris
Hi,
We have built a new server (RHEL VM)and added that IP/hostname into dns zone configs file on DNS server (Solaris 10). Reloaded the configuration using
and added nameserver into resolv.conf on client. But when I am trying nslookup, its not getting resolved. The nameserver is not able to... (8 Replies)
Discussion started by: snchaudhari2
8 Replies
UDHCPC(8) GNU/Linux Administrator's Manual UDHCPC(8)
NAME
udhcpc - very small DHCP client
SYNOPSIS
udhcpc [OPTION]...
DESCRIPTION
The udhcp client negotiates a lease with the DHCP server and executes a script when it is obtained or lost.
OPTIONS
-c CLIENTID, --clientid=CLIENTID
Send the client identifier CLIENTID.
-f, --foreground
Do not fork after obtaining a lease.
-H HOSTNAME, --hostname=HOSTNAME
Send the client hostname HOSTNAME.
-h HOSTNAME
Alias for -H HOSTNAME.
-i INTERFACE, --interface=INTERFACE
Configure INTERFACE.
-n, --now
Exit with failure if a lease cannot be obtained.
-p FILE, --pidfile=FILE
Write the process ID of the daemon to FILE.
-q, --quit
Exit after obtaining a lease.
-r ADDRESS, --request=ADDRESS
Request IP address ADDRESS.
-s FILE, --script=FILE
Use script FILE.
-v, --version
Display version.
USAGE
When an event occurs, udhcpc executes a script. There are four possible arguments to this script:
deconfig
deconfig is used when udhcpc starts, and when a lease is lost. The script should put the interface in an up, but deconfigured,
state.
bound bound is used when udhcpc moves from an unbound to a bound state. The script should configure the interface and set any other rele-
vant parameters (e.g., default gateway, dns server, etc.).
renew renew is used when udhcpc when a lease is renewed. The interface is already configured, so the IP address will not change. Other
parameters (e.g., default gateway, subnet mask, dns server) may.
nak nak is used when udhcpc receieves a NAK packet from the server. The enviromental variable $message will contain the reason for the
NAK message if the server included one. Processing this message is optional, as the script will also be called with deconfig if need
be.
Parameters are passed to the script via the following environment variables:
HOME The inherited HOME, or "/" if it is unset.
PATH The inherited PATH, or "/bin:/usr/bin:/sbin:/usr/sbin" if it is unset.
interface
The interface.
ip The client IP address.
siaddr The BOOTP next server option.
sname The BOOTP server name option.
boot_file
The BOOTP boot file option.
subnet The subnet mask.
timezone
The timezone offset from UTC in seconds.
router The list of routers.
timesvr
The list of time servers.
namesvr
The list of IEN 116 name servers.
dns The list of DNS servers.
logsvr The list of MIT-LCS UDP log servers.
cookiesvr
The list of RFC 865 cookie servers.
lprsvr The list of LPR servers.
hostname
The host name.
bootsize
The length in 512-octet blocks of the bootfile.
domain The domain name of the network.
swapsvr
The client's swap server.
rootpath
The path of the client's root dist.
ipttl The TTL.
mtu The MTU.
broadcast
The broadcast address.
ntpsrv The list of NTP servers.
wins The list of WINS servers.
lease The lease time in seconds.
dhcptype
The DHCP message type (safely ignored).
serverid
The server IP address.
message
Reason for a DHCPNAK.
tftp The TFTP server name.
bootfile
The bootfile name.
FILES
/usr/share/udhcpc/default.script
Script run when leases are obtained or lost.
NOTES
udhcpc responds to the following signals:
SIGUSR1
This signal causes udhcpc to renew the current lease or, if it does not have one, obtain a new lease.
SIGUSR2
This signal caused udhcpc to release the current lease.
GNU
/Linux 2001-09-26 UDHCPC(8)