Re: routing question
* nate (debian-user@aphroland.org) spake thusly:
>
> from the looks of the info you gave machine A and E are on
> the same hub..the cables seem to work as they can both get to
> the dsl..so my guess would be theres a incorrect netmask or
> broadcast address set on either A or E, and the DSL gateway
> doesn't seem to care. since machine A and E are on the same subnet
> and on the same hub theres no routing involved ..its just "there".
here's the /etc/network/interfaces for machine e (debian woody):
iface eth0 inet static
address 192.168.1.99
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.254
machine a (RH6.2) fires up eth0 and eth1 via /etc/rc.d/rc.local with the
following statements:
ifconfig eth1 192.168.2.1 netmask 255.255.255.0 broadcase 192.168.2.255 up
ifconfig eth0 192.168.1.10 netmask 255.255.255.0 broadcast 192.168.1.255 up
route add -net 192.168.2.0 netmask 255.255.255.0 eth1
route add -net 192.168.1.0 netmask 255.255.255.0 eth0
the broadcast / netmask scenario you described (while potentially
problematic) seems to be okay. unless i'm overlooking the obvious.
> either that or you may have
> firewall rules on one or the other
> that could be blocking traffic. my
> guess would be bad broadcast
> somewhere tho ive had similar
> problems.
machine e has no firewall. machine a contains the following:
/sbin/ipchains -A input -j ACCEPT -i eth0 -s 0/0 67 -d 0/0 68 -p udp
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -s 192.168.2.0/24 -j MASQ
as further background, i can ssh from a machine on the internet to
machine a. also, i can ssh from machines on the 192.168.2.x to
machine a. it seems that only machine e (192.168.1.99) can't
successfully get to (or see) machine a.
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