Re: Sending ICMP echo request out
"Nikolay S." <[email protected]>
| Newsgroups | org.kernel.vger.linux-newbie,org.kernel.vger.netfilter |
|---|---|
| Message-ID | <[email protected]> |
В Пт., 09/12/2011 в 00:00 +0530, anil dahiya пишет: > Hi , > > I have following setup with routing table as shown below: > > +-----------------------+ > | 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 | | > | |----------------+ > +------------------------+ > > Routing table details of setup > ------------------------------------------ > System-1 > ----- > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use 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 > > > Router > ----------- > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use 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 > > > System-2 > ------ > $route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref Use 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 > > > 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 NIC > i.e 192.168.11.6 or 192.168.12.6 ? Why this is happening ? Can you > help me ? > > I have observed same type of symtoms when I do SSH from 192.168.11.5 > to 192.168.12.6 > > 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. > > 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