Warm Greetings,
Yesterday, I upgraded an ancient 2.4.20 kernel to 2.4.28 on a linux router running debian for a small home network. Because the box in question functions as a router, I added all sorts of networking options in the config like IP: Advanced Router and QoS (I wanted to try out HTB and CBQ) that weren't present in the old 2.4.20 config.
After setting it up, the network was up and going as usual. However, I noticed something strange...none of the clients connected to the linux router could access some login sites like http://mail.yahoo.com and hotmail.com. Gmail functions perfectly though, and I can access all these sites from the linux box itself. From tracerouting and pinging, I can see however that packets coming from the network clients are indeed reaching mail.yahoo.com. After concluding that I may be dropping the return packets, I tried doing
echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
..and to all rp_filters under /proc/sys/net/ipv4/conf, but it didn't work. I also tried flushing all the iptables rules and putting basic NAT/forwarding functionality, still to no avail.
I finally recompiled the kernel after configuring back the networking options to reflect what it was like in the old 2.4.20 kernel. However, I did leave all the netfilter options compiled as modules. Using this kernel however didn't change anything...clients still can't log in yahoo.com and hotmail.com.
I'm pretty stumped. Does anyone here know what's going on? Perhaps I'm looking in the wrong places? Apologies if this was tackled before. Thanks and more power.
-Paul Patrick Carpio Prantilla
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