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DHCP ok, Can't ping ...

Hi all,

I'm newbie to Linux and that's my first post.
First I tried to find any other posts on the same issue, googled it around for a while but haven't found anything that could've helped me so, here I am. 

I have the following scenario ( simple one by the way ):

10.0.0.0---(eth1).Linux Box.(eth0) ---216.x.y.0
Firstly I did the install ( Kernel 2.2.x ) via network. Then set up both Ethernet adapters, one Intel PCI and Intel EtherExpress 16 ISA. 

DHCP's fine and I can ping the gateway from the inside. Cool.
Then by the time I was going to do IP Masquarading ( with IPTABLES ), I learned kernel 2.2.X doesn't support it so decided to do the upgrade. Cool, my first kernel compilation.
So, I upgraded to 2.4.18, set up the ethers, and everything is ok, DHCP is ok.
I hoop up my Powerbook to eth1 ( inside adapter ) and get an IP from the DHCP. Fine.
Problem is: I can't ping it. Odd. I get the IP from the DHCP but cannot ping it.
I also tried to ssh it ( that's my only TCP port open - 22 ) because firstly I suspected there was something blocking ICMP packets and stuff, but also got : "host is down" or something ( don't remember exactly ) 

From my box:

g4:~ rodrigo$ ifconfig
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
        inet6 ::1 prefixlen 128
        inet6 fe80::1 prefixlen 64 scopeid 0x1
        inet 127.0.0.1 netmask 0xff000000

en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet6 fe80::20d:93ff:fec3:7a74 prefixlen 64 scopeid 0x4
        inet 10.0.0.10 netmask 0xffffff00 broadcast 10.0.0.255
        ether 00:0d:93:c3:7a:74
        media: autoselect (10baseT/UTP <half-duplex>) status: active


g4:~ rodrigo$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
ping: sendto: Host is down
ping: wrote 10.0.0.1 64 chars, ret=-1
ping: sendto: Host is down
ping: wrote 10.0.0.1 64 chars, ret=-1
ping: sendto: Host is down
ping: wrote 10.0.0.1 64 chars, ret=-1
ping: sendto: Host is down

g4:~ rodrigo$ arp -a
? (10.0.0.1) at (incomplete) on en0 [ethernet]
? (10.0.0.255) at ff:ff:ff:ff:ff:ff on en0 [ethernet]

g4:~ rodrigo$ ping 10.0.0.255
PING 10.0.0.255 (10.0.0.255): 56 data bytes
64 bytes from 10.0.0.10: icmp_seq=0 ttl=64 time=0.204 ms
64 bytes from 10.0.0.1: icmp_seq=0 ttl=255 time=16.544 ms (DUP!)
64 bytes from 10.0.0.10: icmp_seq=1 ttl=64 time=0.215 ms
64 bytes from 10.0.0.1: icmp_seq=1 ttl=255 time=1.652 ms (DUP!)


Duplicated packets ... weird ...

g4:~ rodrigo$ arp -a
? (10.0.0.1) at (incomplete) on en0 [ethernet]
? (10.0.0.255) at ff:ff:ff:ff:ff:ff on en0 [ethernet]

I also tried with a Windows box and got the same results.


From the Linux box ( the server ):

Linux debian 2.4.18 #4 SMP Tue Aug 17 04:42:59 PDT 2004 i586 unknown


debian:/home/rodrigo# route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface 216.x.y.0 * 255.255.255.128 U 0 0 0 eth0 10.0.0.0 * 255.255.255.0 U 0 0 0 eth1 default 216-x-y-1.ip 0.0.0.0 UG 0 0 0 eth0 



.config that I used to compile the new kernel ( skipped some parts ):

# Networking options
#
CONFIG_PACKET=m
CONFIG_PACKET_MMAP=y
CONFIG_NETLINK_DEV=m
CONFIG_NETFILTER=y
CONFIG_NETFILTER_DEBUG=y
CONFIG_FILTER=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
# CONFIG_IP_ADVANCED_ROUTER is not set
# CONFIG_IP_PNP is not set
CONFIG_NET_IPIP=m
# CONFIG_NET_IPGRE is not set
# CONFIG_IP_MROUTE is not set
# CONFIG_ARPD is not set
# CONFIG_INET_ECN is not set
CONFIG_SYN_COOKIES=y


#   IP: Netfilter Configuration
#
CONFIG_IP_NF_CONNTRACK=m
CONFIG_IP_NF_FTP=m
CONFIG_IP_NF_IRC=m
CONFIG_IP_NF_QUEUE=m
CONFIG_IP_NF_IPTABLES=m
CONFIG_IP_NF_MATCH_LIMIT=m
CONFIG_IP_NF_MATCH_MAC=m
CONFIG_IP_NF_MATCH_MARK=m
CONFIG_IP_NF_MATCH_MULTIPORT=m
# CONFIG_IP_NF_MATCH_TOS is not set
# CONFIG_IP_NF_MATCH_AH_ESP is not set
# CONFIG_IP_NF_MATCH_LENGTH is not set
# CONFIG_IP_NF_MATCH_TTL is not set
CONFIG_IP_NF_MATCH_TCPMSS=m
CONFIG_IP_NF_MATCH_STATE=m
CONFIG_IP_NF_MATCH_UNCLEAN=m
CONFIG_IP_NF_MATCH_OWNER=m
CONFIG_IP_NF_FILTER=m
CONFIG_IP_NF_TARGET_REJECT=m
# CONFIG_IP_NF_TARGET_MIRROR is not set
CONFIG_IP_NF_NAT=m
CONFIG_IP_NF_NAT_NEEDED=y

CONFIG_IP_NF_TARGET_MASQUERADE=m
# CONFIG_IP_NF_TARGET_REDIRECT is not set
# CONFIG_IP_NF_NAT_SNMP_BASIC is not set
CONFIG_IP_NF_NAT_IRC=m
CONFIG_IP_NF_NAT_FTP=m
CONFIG_IP_NF_MANGLE=m
# CONFIG_IP_NF_TARGET_TOS is not set
CONFIG_IP_NF_TARGET_MARK=m
CONFIG_IP_NF_TARGET_LOG=m
# CONFIG_IP_NF_TARGET_ULOG is not set
CONFIG_IP_NF_TARGET_TCPMSS=m
CONFIG_IP_NF_COMPAT_IPCHAINS=m
CONFIG_IP_NF_NAT_NEEDED=y
CONFIG_IP_NF_COMPAT_IPFWADM=m
CONFIG_IP_NF_NAT_NEEDED=y
# CONFIG_IPV6 is not set
# CONFIG_KHTTPD is not set
# CONFIG_ATM is not set
# CONFIG_VLAN_8021Q is not set
# CONFIG_IPX is not set
# CONFIG_ATALK is not set
# CONFIG_DECNET is not set
# CONFIG_BRIDGE is not set
# CONFIG_X25 is not set
# CONFIG_LAPB is not set
# CONFIG_LLC is not set
# CONFIG_NET_DIVERT is not set
# CONFIG_ECONET is not set
# CONFIG_WAN_ROUTER is not set
# CONFIG_NET_FASTROUTE is not set
# CONFIG_NET_HW_FLOWCONTROL is not set


Tried to ping my box from the Linux box. Nothing.

debian:/home/rodrigo# arp -n -i eth1
Address HWtype HWaddress Flags Mask iFace 
10.0.0.10      ether      00:0D:93:C3:7A:74          C              eth1

debian:/home/rodrigo# arp -a -i eth1
? ( 10.0.0.10 ) at 00:0D:93:C3:7A:74 [ether] on eth1

Sorry for the long email.

Any ideas ?

Rodrigo Otavio Paes de Barros Otaviano
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