From: "Jet" <yenjet.chan@eglobal.com.my>
To: Ben Tan <linuxnewbie74@hotmail.com>, a <netfilter@lists.netfilter.org>
Subject: Re: does the ip_conntrack subjected to DOS attack???
Date: Tue, 5 Nov 2002 11:37:22 +0800 [thread overview]
Message-ID: <001701c2847c$a7cf5870$0bc8c80a@dolphin> (raw)
In-Reply-To: 002401c28193$9fcbbba0$1801010a@demo
[-- Attachment #1: Type: text/plain, Size: 1058 bytes --]
Just want to check with you on how much RAM do you have? What is the max table size (cat /proc/sys/net/ipv4/ip_conntrack_max) and if possible what is the size of the connection table before it crashes?
I have the same problem too on kernel 2.4.18-xfs. What is yours? I believe the bug is called OOM (out-of-memory).
.//Jet
----- Original Message -----
From: Ben Tan
To: a
Sent: Friday, November 01, 2002 6:44 PM
Subject: does the ip_conntrack subjected to DOS attack???
hi,
it seems that once the ip_conntrack table is being filled up, the system will crash.
Does it means that it is very vulnerable to DOS attack?
I have performed a port scan using nmap on my box, and it is able to scan alot of ports being opened? How come this happened? I only allow established,related tcp packets and tcp port 22 New on INPUT to the box? The default policy is DROP.
The result is
port 22 open
port 80 open
Why it is so? Pls advise. Thanks in advanced.
ben
[-- Attachment #2: Type: text/html, Size: 3117 bytes --]
prev parent reply other threads:[~2002-11-05 3:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-01 10:44 does the ip_conntrack subjected to DOS attack??? Ben Tan
2002-11-05 3:37 ` Jet [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='001701c2847c$a7cf5870$0bc8c80a@dolphin' \
--to=yenjet.chan@eglobal.com.my \
--cc=linuxnewbie74@hotmail.com \
--cc=netfilter@lists.netfilter.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox