On 6/11/05, Roberto C. Sanchez <[EMAIL PROTECTED]> wrote: > On Sat, Jun 11, 2005 at 08:25:14PM +1200, Dominik Margraf wrote: > > > > I also installed ipmasq on computer A. Computer A was able to access > > the internet. Both Computer A and B could also ping each other > > successfully and computer B was also able to share internet from > > computer A > > > What is the output of '/sbin/route -n' from each computer?
for Computer A (the one connected to the ADSL modem): [EMAIL PROTECTED]:~$ /sbin/route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 eth1 0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth1 [EMAIL PROTECTED]:~$ (note: eth1 is the port connected to the ADSL modem and eth0 is the port connected to Computer B via a crossover cable) for Computer B: [EMAIL PROTECTED]:~$ /sbin/route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 0.0.0.0 192.168.0.1 0.0.0.0 UG 0 0 0 eth0 [EMAIL PROTECTED]:~$ > > > However after I reinstalled Computer A with the newly released debian > > 3.1r0a (with exactly the same settings described above) with ipmasq, > Uh. Why did you reinstall? > Because I would like to reallocate the disc space and set up a new partition for storing my DVD files. > > computer B could not obtain internet access any more despite computer > > A still had internet access and computer B was also able to share CUPS > > and NFS services from computer A successfully. Also, computer B was > > able to ping computer A and vice versa. > > > > So what could go wrong here? Is it because some problems with the > > firewall and/or ipmasq? How could I fix this problem? > What firewall program/configuration are you using? What is the output > if 'iptables -nL' ? > > -Roberto I did not intentionally install firewall program for both computer or tweak the firewall configurations. I just installed the ipmasq package, which allows NAT by recomputing the firewall rules. However there are the printouts for "iptablees -nL" of both computers: Computer A: debian1:/home/abc# iptables -nL Chain INPUT (policy DROP) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 LOG all -- 127.0.0.0/8 0.0.0.0/0 LOG flags 0 level 4 DROP all -- 127.0.0.0/8 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 255.255.255.255 ACCEPT all -- 192.168.0.0/24 0.0.0.0/0 ACCEPT !tcp -- 0.0.0.0/0 224.0.0.0/4 LOG all -- 192.168.0.0/24 0.0.0.0/0 LOG flags 0 level 4 DROP all -- 192.168.0.0/24 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 255.255.255.255 ACCEPT all -- 0.0.0.0/0 10.1.1.5 ACCEPT all -- 0.0.0.0/0 10.255.255.255 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy DROP) target prot opt source destination ACCEPT all -- 192.168.0.0/24 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTAB LISHED LOG all -- 0.0.0.0/0 192.168.0.0/24 LOG flags 0 level 4 DROP all -- 0.0.0.0/0 192.168.0.0/24 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy DROP) target prot opt source destination ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- 0.0.0.0/0 255.255.255.255 ACCEPT all -- 0.0.0.0/0 192.168.0.0/24 ACCEPT !tcp -- 0.0.0.0/0 224.0.0.0/4 LOG all -- 0.0.0.0/0 192.168.0.0/24 LOG flags 0 level 4 DROP all -- 0.0.0.0/0 192.168.0.0/24 ACCEPT all -- 0.0.0.0/0 255.255.255.255 ACCEPT all -- 10.1.1.5 0.0.0.0/0 ACCEPT all -- 10.255.255.255 0.0.0.0/0 LOG all -- 0.0.0.0/0 0.0.0.0/0 LOG flags 0 level 4 DROP all -- 0.0.0.0/0 0.0.0.0/0 debian1:/home/abc# Computer B: debian2:/home/abc# iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination debian2:/home/abc# Thank you very much for your help and I would be grateful if you could find the culprit! Dominik
