Linux MIPS box: ICMP (ping) funciona, mas o TCP não - como consertá-lo?

Question

Estou tentando configurar a rede de caixas MIPS Linux. Aqui está a configuração:

~ # ifconfig 
eth0      Link encap:Ethernet  HWaddr CC:5D:4E:FF:45:7F  
          inet addr:192.168.0.2  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::ce5d:4eff:feff:2178/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1333 errors:0 dropped:10 overruns:0 frame:0
          TX packets:573 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:107853 (105.3 KiB)  TX bytes:45385 (44.3 KiB)
          Interrupt:5 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:9 errors:0 dropped:0 overruns:0 frame:0
          TX packets:9 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:936 (936.0 B)  TX bytes:936 (936.0 B)

~ # route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.0.1     0.0.0.0         UG    0      0        0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0

~ # cat /etc/resolv.conf 
nameserver 8.8.8.8

~ # iptables -L
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

Sou capaz de acessar os recursos da Internet por aditivos IP:

~ # ping 8.8.8.8         
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=0 ttl=44 time=60.757 ms
^C
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 60.757/60.757/60.757 ms

Mas o DNS não funciona:

~ # ping google.com
ping: bad address 'google.com'

E até mesmo os recursos HTTP locais estão indisponíveis:

~ # wget http://192.168.0.1/
Connecting to 192.168.0.1 (192.168.0.1:80)
wget: can't connect to remote host (192.168.0.1): Connection timed out

Conexões TCP perdidas no estado SYN_RECV / SYN_SENT:

~ # netstat -n
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State         
tcp        0      0 192.168.0.2:80          192.168.0.3:44939       SYN_RECV    <-incoming TCP
tcp        0      1 192.168.0.2:40019       192.168.0.1:80          SYN_SENT    <-outgoing TCP
udp        0      0 192.168.0.2:42177       8.8.8.8:53              ESTABLISHED

O que pode estar errado? Obrigado.