Date: Wed, 25 May 2005 17:46:03 +0200 From: FreeBSD questions mailing list <FreeBSD@amadeus.demon.nl> To: freebsd <freebsd-questions@freebsd.org> Subject: ICMP redirect Message-ID: <347676E8-FBF5-4146-BC53-ADC1DDA761E0@amadeus.demon.nl>
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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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