: bad interpreter: No such file or directory

lnx8 · 04-28-2004, 09:06 AM

Hi, I get following error message when trying to execute a simple NAT script :
[root@gareway net]# ./nat
: bad interpreter: No such file or directory

Code:

[root@gareway net]# ls -al
total 16
drwxr-xr-x    2 root     root         4096 Jan  1 19:50 .
drwxr-xr-x   13 root     root         4096 Apr 28  2004 ..
-rwxr-xr-x    1 root     root          799 Apr 28  2004 firewall
-rwxr-xr-x    1 root     root          814 Jan  1 19:50 nat
[root@gareway net]# vi nat
!/bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_nat
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp
iptables -N syn-flood
iptables -A INPUT -p tcp --syn -j syn-flood
iptables -I syn-flood -p tcp -m limit --limit 3/s --limit-burst 6 -j RETURN
iptables -A syn-flood -j REJECT
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -d 0/0 -o eth1 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth0 -p tcp -s 192.168.0.0/24 --dport 80 -j REDIRECT --to -port 8080

Code:

[root@gareway net]# whereis /bin/bash
bash: /bin/bash /usr/lib/bash /usr/share/man/man1/bash.1.gz
[root@gareway net]#

I get following the error when execute "bash nat"

Code:

[root@gareway net]# bash nat
: No such file or directoryipv4/ip_forward
: No such file or directoryipv4/conf/all/rp_filter
: No such file or directoryipv4/tcp_syncookies
modprobe: Can't locate module ip_tables
modprobe: Can't locate module iptable_filter
modprobe: Can't locate module iptable_nat
modprobe: Can't locate module ip_conntrack
modprobe: Can't locate module ip_conntrack_ftp
modprobe: Can't locate module ip_nat_ftp
iptables: Chain already exists
'ptables v1.2.6a: Invalid target name `syn-flood
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.2.6a: Invalid target name `RETURN
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.2.6a: Invalid target name `REJECT
Try `iptables -h' or 'iptables --help' for more information.
'ptables v1.2.6a: Invalid target name `MASQUERADE
Try `iptables -h' or 'iptables --help' for more information.
[root@gareway net]#

thx!

rkef · 04-28-2004, 11:44 AM

Quote:

!/bin/bash

Is that just a "mis-paste" or did you forget that it should be '#!/bin/bash' (the sha in the shabang)?

lnx8 · 04-28-2004, 08:12 PM

Quote:

Originally posted by rkef
Is that just a "mis-paste" or did you forget that it should be '#!/bin/bash' (the sha in the shabang)?

sorry, i write erro

thanks point out.
source text is such:

Code:

[root@gareway net]# vi nat
#!/bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
echo 1 > /proc/sys/net/ipv4/tcp_syncookies
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe iptable_nat
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp
iptables -N syn-flood
iptables -A INPUT -p tcp --syn -j syn-flood
iptables -I syn-flood -p tcp -m limit --limit 3/s --limit-burst 6 -j RETURN
iptables -A syn-flood -j REJECT
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -d 0/0 -o eth1 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth0 -p tcp -s 192.168.0.0/24 --dport 80 -j REDIRECT --to -port 8080

Tinkster · 04-28-2004, 08:19 PM

You may want to have a look at your kernel configuration :)

Looks like a few things are missing, both in iptables and
the proc file-system.

Cheers,
Tink

lnx8 · 04-29-2004, 02:56 AM

Thanks!
go home again try.