Re: Sending ICMP echo request out
"Nikolay S." <[email protected]> Thu, 08 Dec 2011 23:59:04 +0400
| Newsgroups | gmane.linux.newbie,gmane.comp.security.firewalls.netfilter.general,gmane.linux.network.general |
|---|---|
| Message-ID | <[email protected]> |
=D0=92 =D0=9F=D1=82., 09/12/2011 =D0=B2 00:00 +0530, anil dahiya =D0=BF= =D0=B8=D1=88=D0=B5=D1=82: > Hi , >=20 > I have following setup with routing table as shown below: >=20 > +-----------------------+ > | System-1 | > | "client" | > |------------------------| > | 192.168.11.5 | > +----------------------+ > | > | > +------+-----+ > | Switch +----------------------+ > +------+-----+ | > | | > | +-------------------------+ > | | 192.168.11.1 | > | |---------------------------| > | | Router | > | |-------------------------- | > | | 192.168.12.1 | > | +--------------------------+ > | | > | | > +------------------------+ | > | 192.168.11.6 | | > |--------------------------| | > | System-2 | | > |--------------------------| | > | 192.168.12.6 | | > | |----------------+ > +------------------------+ >=20 > Routing table details of setup > ------------------------------------------ > System-1 > ----- > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref U= se Iface > 192.168.11.0 0.0.0.0 255.255.255.0 U 1 0 = 0 eth1 > 0.0.0.0 192.168.11.1 0.0.0.0 UG 0 0 = 0 eth1 >=20 >=20 > Router > ----------- > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref U= se Iface > 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 = 0 eth1 > 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 = 0 eth0 >=20 >=20 > System-2 > ------ > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref U= se Iface > 192.168.12.0 0.0.0.0 255.255.255.0 U 0 0 = 0 eth1 > 192.168.11.0 0.0.0.0 255.255.255.0 U 0 0 = 0 eth0 > 0.0.0.0 192.168.12.1 0.0.0.0 UG 0 0 = 0 eth1 >=20 >=20 > When I do ping from system-1 192.168.11.5 to system-2 192.168.12.6 , > ping echo packet is reaching on system-2 through NIC 192.168.12.6 but > system is not sending any response to 192.168.11.5 using either of NI= C > i.e 192.168.11.6 or 192.168.12.6 ? Why this is happening ? Can you > help me ? >=20 > I have observed same type of symtoms when I do SSH from 192.168.11.5 > to 192.168.12.6 >=20 > FYI, > ip_forwarding is enable on router and iptables are no configured on > any of system . I think, reverse path filtering is the problem here. >=20 > Thanks, > Anil > -- > To unsubscribe from this list: send the line "unsubscribe netfilter" = in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-newbie"= in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs