Hi
I have server A and server B.
On server B the directory is called /tmp/hmp
On server A I want to get the files on server B:/tmp/hmp via FTP. After I have got the files via FTP I have to delete them. In the script below I'm affraid of that I delete files before I get them by ftp.
... (1 Reply)
Hi all,
I'm using the following script to automated ftp files to 1 ftp servers
host=192.168.0.1
/usr/bin/ftp -vi >> $bkplog 2>&1 <<ftp
open $host
bin
cd ${directory}
put $files
quit
ftp
and the .netrc file contain
machine 192.168.0.1
login abc... (4 Replies)
Hi All,
I need an automation script to check the connectivity between 2 UNIX servers.
Could anybody please help in this regards?
regards,
janardhan (1 Reply)
We have two servers A and B (both running Solaris 10) out of which one is application server and the other is database server. The two servers faced certain network issues and the two servers were temporarily disconnected.this happened around 5AM GMT monday.Can anyone suggest some log files or... (2 Replies)
HI I have made a connection with external server which is also UNIX. I was tryign connectivity with this by telnet which fails and ping i sshowing socket is alive and traceroute tells the asterisk astersik:traceroute to 153.88.182.28 (153.88.182.28), 30 hops max, 8080 byte packets
1 * * *
2 *... (1 Reply)
Hi,
I am trying to connect to the database through Unix serer using following command-
mysql -u root -Jepadt -D dtdatabase
But it giving me error -
mysql: unknown option '-J'
Can anybody help me to solve this problm
Thanks in advance
Please use code tags, thanks. (2 Replies)
Hi
Can we pass the parameter from the excel in windows and invoke the unix shell script from excel VBA by passing this parameter and get the results of shell script to the excel sheet?
We tried to get the things in unix independently but we still strucked in connecting the excel to... (5 Replies)
ello,
i am new to the networking side.
I have a requirement to check the tcp network connectivity between server it's running on and the list of host's and ports combination.
please help me where i am going wrong.
my code:
#!/bin/bash
#read the file line by line
cd "$1"
cat... (17 Replies)
I am trying to establish passwordless connectivity between server A and server B, but unsuccessfuly, because I beleive two issues.
the first one is that on both servers, it is not possible to use root to login, it only allows to connect using a user (any) them su - root, which in turns I am able... (1 Reply)
Discussion started by: fretagi
1 Replies
LEARN ABOUT DEBIAN
blackhole
BLACKHOLE(4) BSD Kernel Interfaces Manual BLACKHOLE(4)NAME
blackhole -- a sysctl(8) MIB for manipulating behaviour in respect of refused TCP or UDP connection attempts
SYNOPSIS
sysctl net.inet.tcp.blackhole[=[0 | 1 | 2]]
sysctl net.inet.udp.blackhole[=[0 | 1]]
DESCRIPTION
The blackhole sysctl(8) MIB is used to control system behaviour when connection requests are received on TCP or UDP ports where there is no
socket listening.
Normal behaviour, when a TCP SYN segment is received on a port where there is no socket accepting connections, is for the system to return a
RST segment, and drop the connection. The connecting system will see this as a ``Connection refused''. By setting the TCP blackhole MIB to
a numeric value of one, the incoming SYN segment is merely dropped, and no RST is sent, making the system appear as a blackhole. By setting
the MIB value to two, any segment arriving on a closed port is dropped without returning a RST. This provides some degree of protection
against stealth port scans.
In the UDP instance, enabling blackhole behaviour turns off the sending of an ICMP port unreachable message in response to a UDP datagram
which arrives on a port where there is no socket listening. It must be noted that this behaviour will prevent remote systems from running
traceroute(8) to a system.
The blackhole behaviour is useful to slow down anyone who is port scanning a system, attempting to detect vulnerable services on a system.
It could potentially also slow down someone who is attempting a denial of service attack.
WARNING
The TCP and UDP blackhole features should not be regarded as a replacement for firewall solutions. Better security would consist of the
blackhole sysctl(8) MIB used in conjuction with one of the available firewall packages.
This mechanism is not a substitute for securing a system. It should be used together with other security mechanisms.
SEE ALSO ip(4), tcp(4), udp(4), ipf(8), ipfw(8), pfctl(8), sysctl(8)HISTORY
The TCP and UDP blackhole MIBs first appeared in FreeBSD 4.0.
AUTHORS
Geoffrey M. Rehmet
BSD January 1, 2007 BSD