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Problem with linux-box and subnet

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Special Forums IP Networking Problem with linux-box and subnet
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Old 08-22-2012
Problem with linux-box and subnet
I wish to have the folowing setup on my network:


--- Internet -----eth1-| Linux box |- eth2 --- IP Ranges 192.168.100. 0-255 and 192.168.101. 0-255



On the Linux box I have:
dhcp-server - works fine!
Proxy - works fine - all trafic from port 80 is redirected with a rule in shorewall.
shorewall - maybe the problem is her ?? I'm doing masqerade from eth2 to eth1

I'm subnetting because I need 512 (or 510) IP's - it's on the same pshysical network.

From my hosts on the subnet I can access the internet - but I have trouble accessing other things - eg. update server at microsoft - AVG - update server...
I can't find the error.

My routing table is as folows:
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 56343 ffe.rev.st 0.0.0.0 UG 0 0 0 em1
86.52.0.0 * 255.255.192.0 U 1 0 0 em1
192.168.100.0 * 255.255.254.0 U 1 0 0 em2
192.168.101.0 * 255.255.255.0 U 0 0 0 em2

Thanks in advance for any help !

Regards
Ronny
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LEARN ABOUT HPUX

tc-route

Route classifier in tc(8)					       Linux						 Route classifier in tc(8)

NAME

       route - route traffic control filter

SYNOPSIS

       tc filter ... route [ from REALM | fromif TAG ] [ to REALM ] [ classid CLASSID ] [ action ACTION_SPEC ]

DESCRIPTION

       Match  packets  based  on routing table entries. This filter centers around the possibility to assign a realm to routing table entries. For
       any packet to be classified by this filter, a routing table lookup is performed and the returned realm is used to  decide  on  whether  the
       packet is a match or not.

OPTIONS

       action ACTION_SPEC
	      Apply an action from the generic actions framework on matching packets.

       classid CLASSID
	      Push matching packets into the class identified by CLASSID.

       from REALM
       fromif TAG
	      Perform source route lookups.  TAG is the name of an interface which must be present on the system at the time of tc invocation.

       to REALM
	      Match if normal (i.e., destination) routing returns the given REALM.

EXAMPLES

       Consider the subnet 192.168.2.0/24 being attached to eth0:

	      ip route add 192.168.2.0/24 dev eth0 realm 2

       The following route filter will then match packets from that subnet:

	      tc filter add ... route from 2 classid 1:2

       and pass packets on to class 1:2.

NOTES

       Due  to	implementation	details,  realm  values  must  be  in  a  range from 0 to 255, inclusive. Alternatively, a verbose name defined in
       /etc/iproute2/rt_realms may be given instead.

SEE ALSO

       tc(8), ip-route(8)

iproute2							    21 Oct 2015 					 Route classifier in tc(8)