Andras Toth wrote > Hi Frank, > > As Matt and me earlier pointed out it sounds like the router is > sending ICMP Redirects because they are on a common segment and the > router tries to tell the host a better route exist. You can read more > about redirects here: > http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13714-43.html
Well, it does sound reasonable and like my configuration is bad because it prevents the better route. I can fix this for the static hosts, but we also allow laptops with dhcp in this segment, and they get their information from a dhcp server that is not in my control, and the same... > The slowness occurs as the router cannot forward packets in its > dedicated fast circuits (ASIC or data-plane) because it needs to send > an ICMP Redirect packet to each packet on the same subnet. This is > done in the router CPU (control-plane) which is slower than the > dedicated circuits in the router data-plane. > > Try disabling IPv6 redirects, on Cisco routers it's generally "no ipv6 > redirects" on the routed interfaces, such as the L3 ports or VLAN > Interfaces (SVI). Alternatively fix your topology and routing to > ensure the return traffic does not go through the router in the same > subnet. ...holds for the router, it's managed by our data center. I will write them a mail about this issue and ask for a change in the config, but I don't know if they will care about nit :-) Anyway, your explanations helped to understand what's going on and as I can easily fix this for my own hosts that suffered from this problem, you both helped me a lot, thank you very much! If our data center is willing to change the configuration, I'll let you know if it helped! cu, Frank -- Dipl.-Inform. Frank Steiner Web: http://www.bio.ifi.lmu.de/~steiner/ Lehrstuhl f. Bioinformatik Mail: http://www.bio.ifi.lmu.de/~steiner/m/ LMU, Amalienstr. 17 Phone: +49 89 2180-4049 80333 Muenchen, Germany Fax: +49 89 2180-99-4049 * Rekursion kann man erst verstehen, wenn man Rekursion verstanden hat. *
