ICMP redirect

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To: freebsd <freebsd-questions@freebsd.org>
Date: Wed, 25 May 2005 17:46:03 +0200

Hello,
Lately i get a lot (really a lot) of these errors:

icmp redirect from 127.0.0.1: <my outside IP> => 127.0.0.1

I have no idea where they come from and better how to get rid of them...
Can anyone point me in a direction to solve this problem?
Thanks in advance
Arno

my firewall rules:

#!/bin/sh
################ Start of IPFW rules file
###############################
# Flush out the list before we begin.
ipfw -q -f flush

# Set rules command prefix
cmd="ipfw -q add"
skip="skipto 800"
pif="rl0" # public interface name of NIC
               # facing the public Internet

#################################################################
# No restrictions on Inside LAN Interface for private network
# Change xl0 to your LAN NIC interface name
#################################################################
$cmd 005 allow all from any to any via rl1
$cmd 006 allow all from any to any via rl2

#################################################################
# No restrictions on Loopback Interface
#################################################################
$cmd 010 allow all from any to any via lo0

#################################################################
# check if packet is inbound and nat address if it is
#################################################################
$cmd 014 divert natd ip from any to any in via $pif

#################################################################
# Allow the packet through if it has previous been added to the
# the "dynamic" rules table by a allow keep-state statement.
#################################################################
$cmd 015 check-state

#################################################################
# Interface facing Public Internet (Outbound Section)
# Interrogate session start requests originating from behind the
# firewall on the private network or from this gateway server
# destine for the public Internet.
#################################################################

# Allow out access to my ISP's Domain name server.
# x.x.x.x must be the IP address of your ISP's DNS
# Dup these lines if your ISP has more than one DNS server
# Get the IP addresses from /etc/resolv.conf file
$cmd 020 $skip udp from any to 194.159.73.137 53 out via $pif keep-state
$cmd 021 $skip udp from any to 194.159.73.138 53 out via $pif keep-state

# Allow out access to my ISP's DHCP server for cable/DSL configurations.
#$cmd 030 $skip udp from any to 82.161.19.0/24 67 out via $pif keep-
state
$cmd 031 $skip udp from any to 82.161.19.255 520 out via $pif keep-state

# Allow out non-secure standard www function
$cmd 040 $skip tcp from any to any 80 out via $pif setup keep-state

# Allow out secure www function https over TLS SSL
$cmd 050 $skip tcp from any to any 443 out via $pif setup keep-state

# Allow out send & get email function
$cmd 060 $skip tcp from any to any 25 out via $pif setup keep-state
$cmd 061 $skip tcp from any to any 110 out via $pif setup keep-state

# Allow out FreeBSD (make install & CVSUP) functions
# Basically give user root "GOD" privileges.
$cmd 070 $skip tcp from me to any out via $pif setup keep-state uid root

# Allow out ping
$cmd 080 $skip icmp from any to any out via $pif keep-state

# Allow out Time
$cmd 090 $skip tcp from any to any 37 out via $pif setup keep-state

# Allow out nntp news (i.e. news groups)
#$cmd 100 $skip tcp from any to any 119 out via $pif setup keep-state

# Allow out secure FTP, Telnet, and SCP
# This function is using SSH (secure shell)
$cmd 110 $skip tcp from any to any 22 out via $pif setup keep-state

# Allow out whois
$cmd 120 $skip tcp from any to any 43 out via $pif setup keep-state

# Allow ntp time server
$cmd 130 $skip udp from any to any 123 out via $pif keep-state

# Allow FTP
$cmd 140 $skip all from any to any 20,21 out via $pif setup keep-state

# Allow
$cmd 200 $skip all from any to any 5060,5190,5297,5298,16384-16403
out via $pif setup keep-state
$cmd 201 $skip all from any to any 1863 out via $pif setup keep-state
$cmd 202 $skip all from any to any 8000,8001,8040,8950,9210 out via
$pif setup keep-state
$cmd 203 $skip udp from 82.161.18.200 to 66.172.95.197 5499 out via
$pif keep-state
$cmd 204 $skip tcp from any to any 5500,5501 out via $pif setup keep-
state
$cmd 205 $skip all from any to any 554 out via $pif setup keep-state
$cmd 206 $skip tcp from any to any 6881-6889 out via $pif setup keep-
state
$cmd 207 $skip tcp from any to any 6346 out via $pif setup keep-state
$cmd 208 $skip all from any to any 2401 out via $pif setup keep-state

#################################################################
# Interface facing Public Internet (Inbound Section)
# Interrogate packets originating from the public Internet
# destine for this gateway server or the private network.
#################################################################

# Deny all inbound traffic from non-routable reserved address spaces
$cmd 300 deny all from 192.168.0.0/16 to any in via $pif #RFC 1918
private IP
$cmd 301 deny all from 172.16.0.0/12 to any in via $pif #RFC 1918
private IP
$cmd 302 deny all from 10.0.0.0/8 to any in via $pif #RFC 1918
private IP
$cmd 303 deny all from 127.0.0.0/8 to any in via $pif #loopback
$cmd 304 deny all from 0.0.0.0/8 to any in via $pif #loopback
$cmd 305 deny all from 169.254.0.0/16 to any in via $pif #DHCP auto-
config
$cmd 306 deny all from 192.0.2.0/24 to any in via $pif #reserved
for docs
$cmd 307 deny all from 204.152.64.0/23 to any in via $pif #Sun cluster
$cmd 308 deny all from 224.0.0.0/3 to any in via $pif #Class D &
E multicast

# Deny ident
$cmd 315 deny tcp from any to any 113 in via $pif

# Deny all Netbios service. 137=name, 138=datagram, 139=session
# Netbios is MS/Windows sharing services.
# Block MS/Windows hosts2 name server requests 81
$cmd 320 deny tcp from any to any 137 in via $pif
$cmd 321 deny tcp from any to any 138 in via $pif
$cmd 322 deny tcp from any to any 139 in via $pif
$cmd 323 deny tcp from any to any 81 in via $pif

# Deny any late arriving packets
$cmd 330 deny all from any to any frag in via $pif

# Deny ACK packets that did not match the dynamic rule table
$cmd 332 deny tcp from any to any established in via $pif

# Allow traffic in from ISP's DHCP server. This rule must contain
# the IP address of your ISP's DHCP server as it's the only
# authorized source to send this packet type.
# Only necessary for cable or DSL configurations.
# This rule is not needed for 'user ppp' type connection to
# the public Internet. This is the same IP address you captured
# and used in the outbound section.
$cmd 350 allow udp from 82.161.19.0/24 to any 68 in via $pif keep-state

# Allow in Apache server
$cmd 360 allow tcp from any to me 80 in via $pif setup limit src-addr 2

# Allow in SSH from public Internet
$cmd 370 allow tcp from any to me 8888 in via $pif setup limit src-
addr 1

### Banned IP:
$cmd 379 deny ip from 205.151.204.0/24 to me in via $pif

### Allow in
$cmd 380 allow all from any to me 5500,5501 in via $pif setup keep-state
$cmd 381 allow tcp from any to me 8000 in via $pif setup limit src-
addr 1

# Reject & Log all unauthorized incoming connections from the public
Internet
$cmd 400 deny log all from any to any in via $pif

# Reject & Log all unauthorized out going connections to the public
Internet
$cmd 450 deny log all from any to any out via $pif

# This is skipto location for outbound stateful rules
$cmd 800 divert natd ip from any to any out via $pif
$cmd 801 allow ip from any to any

# Everything else is denied by default
# deny and log all packets that fell through to see what they are
$cmd 999 deny log all from any to any
################ End of IPFW rules file ###############################
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• Previous message: bazzoola: "Re: hostname and domains"
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