Hello, It depends on what you define a router and gateway to be. To me they are the same thing. Anything with an IP address is vulnerable. Its all about how you secure your networking device and how you can prevent hacks/attacks via vulnerabilities and other means. Firewalls are built for this purpose, with enhanced security features like IPS, IDS etc.... To protect the networking environment. Router's have mechanisms like Access Control Lists which can also help protect against threats.
MTU: http://en.wikipedia.org/wiki/MTU_(networking)
In computer networking, the maximum transmission unit (MTU) of a communications protocol of a layer is the size (in bytes) of the largest protocol data unit that the layer can pass onwards. MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.). Standards (Ethernet, for example) can fix the size of an MTU; or systems (such as point-to-point serial links) may decide MTU at connect time.
A larger MTU brings greater efficiency because each packet carries more user data while protocol overheads, such as headers or underlying per-packet delays, remain fixed; the resulting higher efficiency means a slight improvement in bulk protocol throughput. A larger MTU also means processing of fewer packets for the same amount of data. In some systems, per-packet-processing can be a critical performance limitation.
However, this gain is not without some downside. Large packets can occupy a slow link for some time, causing greater delays to following packets and increasing lag and minimum latency. For example, a 1500-byte packet, the largest allowed by Ethernet at the network layer (and hence over most of the Internet), ties up a 14.4k modem for about one second.
Large packets are also problematic in the presence of communications errors. Corruption of a single bit in a packet requires that the entire packet be retransmitted. At a given bit error rate, larger packets are more likely to be corrupted. Retransmissions of larger packets takes longer. Despite the negative effects on retransmission duration, large packets can still have a net positive effect on end-to-end TCP performance.
Hope this helps.
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Please rate useful posts & remember to mark any solved questions as answered. Thank you.
