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[mininet-discuss] interface dropping packets

Srinivasa T N seenutn at
Tue Dec 10 00:30:43 PST 2013

Is there any firewall running (iptables) on g1 and g2?


On Tue, Dec 10, 2013 at 1:48 PM, jean bouderbala
<jean.bouderbala at>wrote:

> I linked two computers in gns3 ( G1 and G2).
> G1-eth0: eth0-G2
> I configured G2:eth0 with a fixed IP address
> I created then a mininet network in G1, using the hwintf I bound H1:eth0
> to the switch s1.
> I used a simple controller l2_learning and a simple topology h1--s1--h2.
> Now from h1 I can ping h2, altough when I try to ping G2, this is what
> happens:
> h1 send an ARP request ( boradcast),
> I find this request in G2:eth0 interface with wireshark
> G2 answers with his mac address... ( same here this packet is seen in
> G2:eth0)
> However the packet doesn't appear in G1:eth0's interface...
> The ping fails then.
> if I ping from G2, h1 receive the arp request and answers.
> G2 receive the arp answer and starts sending ICMP messages.
> Again h1 doesn't get any packet and no ICMP packet reched G1:eth0
> interface.
> It seems that only broadcast packets can get through G1:eth0 ... (MDNS,
> ARP request ...)
> I thought that the interface dropped the packet because the packet's IP or
> MAC address didn't match the interface's... I decided than to enable ipv4
> forwarding but it didn't solve the problem...
> I would appreciate any help with the topic,
> Or any prompt
> Sincerely yours.
> _______________________________________________
> mininet-discuss mailing list
> mininet-discuss at
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