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Martin Hope
DVK
Asked: 2018-01-09 15:31:14 +0800 CST
  • 1

I am trying to build a pre-exec checker in bash (using bash-preexec.sh)

In order to fail the command when the pre-exec hook fails, I need to run shopt -s extdebug (which fails the command when trap DEBUG command returns non-zero RC).

If I run shopt -s extdebug in my shell as a command, this works perfectly fine (the preexec checker just grepped for "OK" in a file containing word "FAIL", so command shouldn't execute):

> grep shopt .bashrc
> bash
bash-4.1$ echo TEST2
TEST2   <=== Expected, since I didn't turn on extdebug yet
bash-4.1$ shopt -s extdebug > /dev/null 2>&1
bash-4.1$ echo TEST2
bash-4.1$ # WHAT WAS EXPECTED. Command failed to execute.

However, when I add the command to my .bashrc, it has no effect:

> grep shopt .bashrc
shopt -s extdebug > /dev/null 2>&1
> bash
bash: /usr/share/bashdb/bashdb-main.inc: No such file or directory
bash: warning: cannot start debugger; debugging mode disabled
bash-4.1$ echo TEST2
TEST2

What am I doing wrong, and how can I execute this in .bashrc (I need to execute it anytime the user logs in)?

bash
Martin Hope
DVK
Asked: 2014-11-12 11:27:53 +0800 CST
  • 0

I have a FiOS router, which has 3 PCs connected to it.

One of the PCs used to run several servers/services; that I previously (using a different router from different ISP) successfully connected to in the past: e.g. FTP server on port 2222, RDP on 3389.

Now, when I try to connect to that PC from other PCs on a new router, NONE of the connections work.

PC in question is Windows XP without any firewall software, IP is allocated using DHCP, router is Verizon FiOS's Actiontech MI424WR-GEN3I.

Here's what I tried:

  • The PC in question connects to Internet successfully (e.g. web browser, chat, etc.. all work)
  • The PC in question is visible from the router's network device list, and the IP matches up with the IP shown via ipconfig /all on the PC
  • The FTP server on the PC in question managed to successfully add itself to port forwarding tables on the router, I see the following rule added: Serv-U_Auto TCP Any -> 2222
  • I tried running tracert to that PC from another PC. Says "Request Timed Out"
    • tracert to the router itself works in 1 hop.
    • tracert from the affected PC to other PCs also times out.
  • I tried telnetting directly to open ports (2222 and 3389). Times out.
  • I even tried ICMP ping test connection feature of the router itself to that PC. That timed out as well, 100% packet loss.

What else can I do to troubleshoot this inability to connect to the PC?

It looks to me as if the router simply stopped routing between the PCs on a LAN, without affecting routing to the WAN internet connection.

But I can't figure out how to verify that in the router's web config software.

routing