From: ibuprofin@painkiller.example.tld.invalid
On Wed, 12 Jun 2013, in the Usenet newsgroup comp.protocols.tcp-ip, in article
, rahul.d
v.agg@gmail.com
wrote:
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>I have two linux machines (A and B) connected to same link
>(ethernet). The MTU supported is 1500.
>If I change the mtu to 1280 of one the host (say B), then can I
>send an ICMP echo packet from node A (of max size as per its mtu
>which is 1500) to node B ?
Why limit it to 1500? Look up "fragmentation" in RFC1122, and then
look at the man page for 'ping' to see what this command is doing:
[fermi ~]$ ping -c 2 -s 65000 jade
PING jade.phx.az.us (192.168.101.11) 65000(65028) bytes of data.
65008 bytes from jade.phx.az.us (192.168.101.11): icmp_seq=1 ttl=64
time=11.3 ms
65008 bytes from jade.phx.az.us (192.168.101.11): icmp_seq=2 ttl=64
time=11.3 ms
--- jade.phx.az.us ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1013ms
rtt min/avg/max/mdev = 11.310/11.328/11.347/0.108 ms
[fermi ~]$
>Will host B be able to receive a packet whose size is greater
>than its MTU ?
MTU is the maximum size packet your interface will TRANSMIT. It is
not the maximum size it will RECEIVE. See my response to Barry in
this thread and look at the tcpdump data.
Is there any particular reason you didn't bother to TRY IT YOURSELF?
>Is there a way host A can discover the decreased MTU of B and then
>can send an ICMP packet of lower size ?
You mean something like RFC1191, RFC1435 and RFC1981? Try reading
RFC2923 for concepts/problems/hints. You may also want to read
RFC1122 for some fundamentals.
Old guy
--- SoupGate-Win32 v1.05
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