Hi all,

I am facing with the following issues.

1.when i boot my server it is failing at ip6tables. I added a wrong rules to ip6tables by mistake.

# /opt/ap/apos/bin/clusterconf/clusterconf ip6tables --m_add "all -A INPUT -o eth1 -j DROP"
Rule ip6tables all -A INPUT -o eth1 -j DROP added

In the above command instead of OUTPUT -0 i have given INPUT -0.

so the system returning error as "cant use -o with INPUT.

now in maintenance mode with root password, i tried to flush & delete rules but it didnt worked. How to do in GREB mode?

Awaiting your reply..

You rename that file or edit the file in single user mode I'd think. Might boot to live media and edit and or change it also.

Not sure I know of a way to do it from any loader like Grub.

Hi Jefro,

Thanks for your Reply. How to rename the file?

In my server i am getting 2 modes. 1.Operational mode 2.maintenance mode.
I can go to Grub> mode in Operational mode by pressing C.
Can you please suggest how to disable ip6tables in Grub mode? Whatever changes i made in maintenance mode is not reflecting if i boot.

Grub can't be used to edit files as far as I know yet.

Boot to a live cd and edit the files you wish may be the best place to start.

If you disable all iptable rules that would kick off on a reboot, the default rules for a freshly booted box would default to just the three tables in ACCEPT mode.

http://serverfault.com/questions/497...ng-oneself-out
https://access.redhat.com/documentat...t-act-sav.html

Flush/Delete and start over-
http://www.thegeekstuff.com/2011/01/...ptables-flush/

ADD and DELETE Rules
https://fedoraproject.org/wiki/How_t...iptables_rules

Hi Ztcoracat,

i tried all the procedure mentioned on the links, but it is not helpful.

I start my server in "Rescue Mode", but when I login, there is no such thing as /etc/sysconfig/iptables to edit.

What can be done so I can edit that file from this rescue mode? Or at least, is there a way to reboot the system while ensuring, iptables is not started, while inside of the rescue mode?

Is there any command to mount files in Grub> mode for fixing?

Boot to a live cd.

Sorry those links didn't help.

I you don't have the /etc/sysconfig/iptables it could be a bug or maybe the iptables are not loading.
That file is responsible for the firewall configuration.
Manual customization of that file is not recommended but it's not prohibited.

http://unix.stackexchange.com/questi...not-recommende
https://access.redhat.com/discussions/1341583

If you didn't set up your setup or system-config-firewall-tui than that's my guess why you don't have that file.
I am not good with deleting, inserting, replacing or flushing rules for iptables. Sorry.
You can break the network connection with mistakes in rules if your not careful.

ASAIK you can't mount files in GRUB but you can edit partitions and the linux image. (edit the kernel line)
Aside from that the file that you can mount in Grub is the file where the first boot image is found and I don't think you want that.

If you mean is there a way to stop iptables? Yes......
Execute 'setup' in the terminal. Than go to "firewall configuration" Uncheck Enabled box and click ok.
<OR> go here and follow these instructions.
http://www.cyberciti.biz/faq/fedora-...able-firewall/

-:::-If you can't disable the iptables before going into rescue mode your best bet is to try what jefro said and boot with a Live CD.-:::-