Comments (4)
tohojo
commented on June 3, 2024
samueljaydan ***@***.***> writes:
Hello,
I'm printing the value of cap_len by increasing it during download in
the code below. After downloading a 700MB file, it is reported as
13MB. What could be the reason for this?
Some of the traffic could be going over a different interface, or maybe
your userspace application reading the events can't keep up and end up
dropping them?
from xdp-tutorial.
samueljaydan
commented on June 3, 2024
Thanks for your answer.
Actually,NAT rule is like below.
Just listening on the ingress interface (enp3s0) . Does XDP have the ability to listen on the egress interface? Or the rule is incorrect?
root@debian12:~# iptables -S -t nat
-P PREROUTING ACCEPT
-P INPUT ACCEPT
-P OUTPUT ACCEPT
-P POSTROUTING ACCEPT
-A POSTROUTING -s 192.168.11.0/24 -o ppp0 -j SNAT --to-source XX.XX.XX.XX
root@debian12:~#
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.11.254 netmask 255.255.255.0 broadcast 192.168.11.255
inet6 fe80::8a09:5bff:fe50:22b2 prefixlen 64 scopeid 0x20<link>
ether 88:09:5b:50:22:b2 txqueuelen 1000 (Ethernet)
RX packets 15233883 bytes 1666706953 (1.5 GiB)
RX errors 1153 dropped 0 overruns 0 frame 1153
TX packets 100384323 bytes 127869902498 (119.0 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 1156
device memory 0xa1300000-a13fffff
from xdp-tutorial.
tohojo
commented on June 3, 2024
samueljaydan ***@***.***> writes:
Thanks for your answer.
Actually,NAT rule is like below.
Just listening on the ingress interface (enp3s0) . Does XDP have the
ability to listen on the egress interface? Or the rule is incorrect?
XDP runs way before NAT, so that shouldn't have any influence on what it
sees. I'd suggest looking for dropped events (there's a way to get the
userspace API to tell you if any events dropped, but I don't have the
details handy).
from xdp-tutorial.
samueljaydan
commented on June 3, 2024
Thanks for your answer.
from xdp-tutorial.
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